So, I tried running ffxivboot.exe manually as worldofneil suggested, and that worked, launcher and game ran with core affinity for all cores. So having pretty much narrowed it down to Steam, I decided to reinstall Steam. I didn't think about the fact that uninstalling steam would delete my default steam library on my SSD where FF14 was installed, so I had to redownload it, Anyway, the problem persists. When I ran the launcher for the first time, it had the proper core affinity settings, but after it finished downloading the entire game and I rebooted my PC, it's back to only running on cores 7 and 8. I don't recall any changes to my PC that may have caused this, besides perhaps a Steam update that I didn't notice. The current version of Steam before I reinstalled it said it was installed 3/5, well after this issue started. Recent driver and Windows updates were also after the issue appeared. System report below.

-=-=-=-=-=-=- FFXIV Information -=-=-=-=-=-=-

MyDocument E:\OneDrive\Documents
ProxyEnable 0
ProxyServer unspecified
ProxyOverride unspecified


-=-=-=-=-=-=- System Information -=-=-=-=-=-=-

SYSTEM_OS Windows 10 Pro 64-bit (6.2, Build 9200) (17763.rs5_release.180914-1434)
SYSTEM_CPU Intel(R) Core(TM) i7-3770K CPU @ 3.50GHz (8 CPUs), ~3.5GHz
SYSTEM_CORE_NUM SYSTEM_CORE_LOGIC 8 SYSTEM_CORE_PHYSICS 4
SYSTEM_BIOS P2.90P
SYSTEM_LANGUAGE English (Regional Setting: English)
SYSTEM_MEMORY 16300.793MB
SYSTEM_VIRTUAL_MEMORY 134217727.875MB
SYSTEM_PAGE_FILE 32684.793MB
SYSTEM_STORAGE C:\ SYSTEM_HARDDISK_DRIVE SYSTEM_TOTALDISC_SPACE 232.284GB SYSTEM_FREEDISC_SPACE 58.025GB
SYSTEM_STORAGE D:\ SYSTEM_HARDDISK_DRIVE SYSTEM_TOTALDISC_SPACE 931.511GB SYSTEM_FREEDISC_SPACE 160.849GB
SYSTEM_STORAGE E:\ SYSTEM_HARDDISK_DRIVE SYSTEM_TOTALDISC_SPACE 1862.891GB SYSTEM_FREEDISC_SPACE 314.982GB
SYSTEM_STORAGE F:\ SYSTEM_HARDDISK_DRIVE SYSTEM_TOTALDISC_SPACE 2794.394GB SYSTEM_FREEDISC_SPACE 821.992GB
SYSTEM_STORAGE G:\ SYSTEM_HARDDISK_DRIVE SYSTEM_TOTALDISC_SPACE 465.762GB SYSTEM_FREEDISC_SPACE 43.580GB
SYSTEM_DIRECTX_VERSION DirectX 12
SYSTEM_GRAPHICS NVIDIA GeForce GTX 1080
SYSTEM_GRAPHICS_DEVICE \\.\DISPLAY9
SYSTEM_GRAPHICS_CHIP GeForce GTX 1080
SYSTEM_GRAPHICS_MAKER NVIDIA
SYSTEM_GRAPHICS_VRAM 8079.000 MB
SYSTEM_GRAPHICS_SHARED_VRAM 8150.396 MB
SYSTEM_GRAPHICS_DAC Integrated RAMDAC
SYSTEM_GRAPHICS_DISPLAY_MODE 2560 x 1440 (32 bit) (144Hz)
SYSTEM_GRAPHICS_DRIVER C:\WINDOWS\System32\DriverStore\FileRepository\nv_dispi.inf_amd64_7a8e74171e1b8492\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nv_dispi.inf_amd64_7a8e74171e1b8492\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nv_dispi.inf_amd64_7a8e74171e1b8492\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nv_dispi.inf_amd64_7a8e74171e1b8492\nvldumdx.dll
SYSTEM_GRAPHICS_DRIVER_VERSION 25.21.0014.1935
SYSTEM_GRAPHICS_DRIVER_DATE 2/28/2019 19:00:00
SYSTEM_GRAPHICS_DRIVER_LANGUAGE English
3.0
SYSTEM_GRAPHICS_PIXEL_SHADER 3.0
SYSTEM_GRAPHICS_VERTEX_TEXTURE SYSTEM_SUPPORT
SYSTEM_GRAPHICS Intel(R) HD Graphics 4000
SYSTEM_GRAPHICS_DEVICE Unknown
SYSTEM_GRAPHICS_CHIP Intel(R) HD Graphics Family
SYSTEM_GRAPHICS_MAKER Intel Corporation
SYSTEM_GRAPHICS_VRAM 1792 MB
SYSTEM_GRAPHICS_SHARED_VRAM SYSTEM_UNKNOWN
SYSTEM_GRAPHICS_DAC Internal
SYSTEM_GRAPHICS_DISPLAY_MODE Unknown
SYSTEM_GRAPHICS_DRIVER igdumdim64.dll,igd10iumd64.dll,igd10iumd64.dll
SYSTEM_GRAPHICS_DRIVER_VERSION 10.18.0010.5059
SYSTEM_GRAPHICS_DRIVER_DATE 8/15/2018 19:00:00
SYSTEM_GRAPHICS_DRIVER_LANGUAGE English

SYSTEM_GRAPHICS_PIXEL_SHADER
SYSTEM_GRAPHICS_VERTEX_TEXTURE
SYSTEM_SOUND Headphones (Sound Blaster Z)
SYSTEM_SOUND_DEVICE_ID {F5767F20-8E0C-4945-B74E-33C2C9D8B3E9}
SYSTEM_SOUND_DEVICE_NAME cthda.sys
SYSTEM_SOUND_DRIVER_VERSION 6.00.0102.0050
SYSTEM_SOUND_DRIVER_LANGUAGE English
SYSTEM_SOUND_DRIVER_DATE 12/20/2016 00:00:00
SYSTEM_SOUND Realtek Digital Output (2- Realtek High Definition Audio)
SYSTEM_SOUND_DEVICE_ID {0AA75671-1DD8-41FE-8CE3-638E5F97D1AB}
SYSTEM_SOUND_DEVICE_NAME RTKVHD64.sys
SYSTEM_SOUND_DRIVER_VERSION 6.00.0001.8419
SYSTEM_SOUND_DRIVER_LANGUAGE English
SYSTEM_SOUND_DRIVER_DATE 4/10/2018 00:00:00
SYSTEM_SOUND Speakers (2- Realtek High Definition Audio)
SYSTEM_SOUND_DEVICE_ID {967C7A30-9E47-4B4A-B27B-E6D263C59CB0}
SYSTEM_SOUND_DEVICE_NAME RTKVHD64.sys
SYSTEM_SOUND_DRIVER_VERSION 6.00.0001.8419
SYSTEM_SOUND_DRIVER_LANGUAGE English
SYSTEM_SOUND_DRIVER_DATE 4/10/2018 00:00:00
SYSTEM_SOUND Dell S2716DG (NVIDIA High Definition Audio)
SYSTEM_SOUND_DEVICE_ID {EC23177A-A00A-40CA-AED0-FB10832819B1}
SYSTEM_SOUND_DEVICE_NAME nvhda64v.sys
SYSTEM_SOUND_DRIVER_VERSION 1.03.0038.0013
SYSTEM_SOUND_DRIVER_LANGUAGE English
SYSTEM_SOUND_DRIVER_DATE 1/15/2019 00:00:00
SYSTEM_SOUND SPDIF-Out (Z625) (Sound Blaster Z)
SYSTEM_SOUND_DEVICE_ID {F33758EA-C5CE-4B96-8D0C-6428AD116727}
SYSTEM_SOUND_DEVICE_NAME cthda.sys
SYSTEM_SOUND_DRIVER_VERSION 6.00.0102.0050
SYSTEM_SOUND_DRIVER_LANGUAGE English
SYSTEM_SOUND_DRIVER_DATE 12/20/2016 00:00:00
SYSTEM_INPUT {6F1D2B60-D5A0-11CF-BFC7444553540000}
SYSTEM_INPUT_NAME Mouse
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 3 SYSTEM_GAMEPAD_BUTTON 8 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {6F1D2B61-D5A0-11CF-BFC7444553540000}
SYSTEM_INPUT_NAME Keyboard
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 128 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {7B767E00-F744-11E8-8001444553540000}
SYSTEM_INPUT_NAME Gaming Mouse G600
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 0 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {68F69E80-E9B7-11E8-8001444553540000}
SYSTEM_INPUT_NAME Razer BlackWidow Elite
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 573 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {68F713B0-E9B7-11E8-8002444553540000}
SYSTEM_INPUT_NAME Razer BlackWidow Elite
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 3 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {68F73AC0-E9B7-11E8-8003444553540000}
SYSTEM_INPUT_NAME Razer BlackWidow Elite
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 1 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {68F761D0-E9B7-11E8-8004444553540000}
SYSTEM_INPUT_NAME Razer BlackWidow Elite
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 1 SYSTEM_GAMEPAD_FOV 0


-=-=-=-=-=-=- Application Information -=-=-=-=-=-=-

FFXIVLauncher
Settings
Settings
NVIDIA GeForce Overlay
boot
Microsoft Edge
Microsoft Edge
Microsoft Edge
Microsoft Store
Microsoft Store
New Tab - Google Chrome


-=-=-=-=-=-=- Install Information -=-=-=-=-=-=-

ASRock Restart to UEFI v1.0.5
Battle.net
Diablo III
Dolby Digital Live Pack
DTS Connect Pack
Everything 1.4.1.895 (x86)
Google Chrome
Hearthstone
Heroes of the Storm
Blade & Soul
IObit Uninstaller 8
MediaMonkey 4.1
NCSOFT Game Launcher
Notepad++ (32-bit x86)
Origin
Overwatch
qBittorrent 4.1.3
Razer Cortex
Razer Synapse
Samsung SideSync
Steam
SumatraPDF
TeamViewer 13
The Elder Scrolls Online
WinPcap 4.1.3
World of Warcraft
Webroot SecureAnywhere
Microsoft Visual C++ 2013 Redistributable (x64) - 12.0.30501
Intel® Driver & Support Assistant
SD Card Formatter
C&C:Online
Microsoft Visual C++ 2013 x86 Minimum Runtime - 12.0.21005
Adobe Premiere Elements 14
Geeks3D FurMark 1.20.4.0
Samsung Magician
Microsoft Visual C++ 2012 Redistributable (x86) - 11.0.61030
. . .
Intel(R) Chipset Device Software
Adobe Photoshop Elements 14
Lexmark Printer Driver Configuration Utility
Anthem™
Google Update Helper
ZyXEL PLA Series Configuration
Microsoft Visual C++ 2005 Redistributable
Microsoft Visual C++ 2005 Redistributable
EVGA Precision XOC
Office 16 Click-to-Run Extensibility Component
Office 16 Click-to-Run Localization Component
Epic Games Launcher
Microsoft Visual C++ 2012 Redistributable (x86) - 11.0.60610
WhatPulse version 2.8.4
Microsoft Visual C++ 2008 Redistributable - x86 9.0.30729.6161
Sound Blaster Z-Series Extras
Microsoft Visual C++ 2012 Redistributable (x64) - 11.0.60610
Microsoft Visual C++ 2012 x86 Additional Runtime - 11.0.61030
Customer Support
Microsoft Visual C++ 2012 x86 Minimum Runtime - 11.0.61030
Microsoft Visual C++ 2017 Redistributable (x86) - 14.10.25008
Blade & Soul
TradeSkillMaster Application version 1.0
Launcher Prerequisites (x64)
Microsoft Visual C++ 2017 x86 Minimum Runtime - 14.10.25008
Microsoft Visual C++ 2012 Redistributable (x64) - 11.0.61030
Black & White® 2
Sound Blaster Z-Series
Asmedia ASM106x SATA Host Controller Driver
Asmedia USB Host Controller Driver
Microsoft Visual C++ 2017 x86 Additional Runtime - 14.10.25008
Microsoft Visual C++ 2010 x86 Redistributable - 10.0.40219
Intel(R) Processor Graphics
Realtek High Definition Audio Driver
Microsoft Visual C++ 2017 Redistributable (x64) - 14.10.25008
Microsoft Visual C++ 2013 Redistributable (x86) - 12.0.30501
Microsoft Visual C++ 2013 x86 Additional Runtime - 12.0.21005
7-Zip 18.06 (x64)
Windows Driver Package - Lexmark International Printer (01/09/2016 2.13.0.0)
ASRock 3TB+ Unlocker v1.1.1
ASRock App Charger v1.0.6
CCleaner
cFosSpeed v10.26
Defraggler
Logitech Gaming Software 9.02
Microsoft Office 365 - en-us
Command and Conquer: Red Alert 3
Warframe
Aquaria
Command and Conquer: Red Alert 3 - Uprising
Darkest Dungeon®
Descent
Descent 2
Descent 3
Brawlhalla
The Elder Scrolls Online
20XX
SMITE
FINAL FANTASY XIV Online
Rabi-Ribi
Ghost of a Tale
Paladins
Them's Fightin' Herds
Killer Instinct
Sword Art Online: Hollow Realization Deluxe Edition
Nightingale Downs
Unigine Superposition Benchmark 1.0
VLC media player
Wacom Tablet
Microsoft Visual C++ 2010 x64 Redistributable - 10.0.40219
Intel(R) Chipset Device Software
Microsoft Visual C++ 2012 x64 Additional Runtime - 11.0.61030
Microsoft Visual C++ 2008 Redistributable - x64 9.0.30729.6161
Epic Games Launcher Prerequisites (x64)
Microsoft Visual C++ 2017 x64 Minimum Runtime - 14.10.25008
Lexmark Universal v2 PS3 Print Driver
Office 16 Click-to-Run Licensing Component
Office 16 Click-to-Run Extensibility Component 64-bit Registration
Microsoft Visual C++ 2013 x64 Additional Runtime - 12.0.21005
Update for Windows 10 for x64-based Systems (KB4023057)
Microsoft Visual C++ 2013 x64 Minimum Runtime - 12.0.21005
Microsoft Visual C++ 2005 Redistributable (x64)
NVIDIA Ansel
NVIDIA Control Panel 419.35
NVIDIA Graphics Driver 419.35
NVIDIA GeForce Experience 3.17.0.126
NVIDIA Optimus Update 35.0.0.0
NVIDIA PhysX System Software 9.19.0218
NVIDIA Update 35.0.0.0
DisplayDriverAnalyzer
NVIDIA SHIELD Streaming
NVIDIA HD Audio Driver 1.3.38.13
NVIDIA Install Application
NVIDIA ABHub
NVIDIA Backend
NVIDIA Container
NVIDIA TelemetryApi helper for NvContainer
NVIDIA LocalSystem Container
NVIDIA Message Bus for NvContainer
NVIDIA NetworkService Container
NVAPI Monitor plugin for NvContainer
NVIDIA Session Container
NVIDIA User Container
NVIDIA Display Container
NVIDIA Display Container LS
NVIDIA Display Watchdog Plugin
NVIDIA Display Session Container
NVIDIA NodeJS
NVIDIA Watchdog Plugin for NvContainer
NVIDIA Telemetry Client
NVIDIA Telemetry Container
NVIDIA Virtual Host Controller
Nvidia Share
NVIDIA ShadowPlay 3.17.0.126
NVIDIA SHIELD Wireless Controller Driver
NVIDIA Update Core
NVIDIA Virtual Audio 4.11.1
Microsoft Visual C++ 2017 x64 Additional Runtime - 14.10.25008
. .
Microsoft Visual C++ 2012 x64 Minimum Runtime - 11.0.61030
Samsung USB Driver for Mobile Phones
Intel(R) Computing Improvement Program
Google Earth Pro


-=-=-=-=-=-=- Proccess Information -=-=-=-=-=-=-

C:\Program Files (x86)\Creative\Sound Blaster Z-Series\Sound Blaster Z-Series Control Panel\SBZ.exe 000038B0
C:\Program Files (x86)\Google\Chrome\Application\chrome.exe 00004474
C:\Program Files (x86)\NVIDIA Corporation\NvNode\NVIDIA Web Helper.exe 00002BC8
C:\Program Files (x86)\Razer\Razer Services\Razer Central\CefSharp.BrowserSubprocess.exe 00004634
C:\Program Files (x86)\Razer\Razer Services\Razer Central\Razer Central.exe 000039D4
C:\Program Files (x86)\Razer\Synapse3\Service\..\UserProcess\Razer Synapse Service Process.exe 00004F54
C:\Program Files (x86)\Razer\Synapse3\WPFUI\Framework\Razer Synapse 3 Host\Razer Synapse 3.exe 000061F4
C:\Program Files (x86)\Steam\Steam.exe 00003BC0
C:\Program Files (x86)\Steam\bin\cef\cef.win7x64\steamwebhelper.exe 00004DDC
C:\Program Files (x86)\Steam\steamapps\common\FINAL FANTASY XIV Online\boot\ffxivlauncher.exe 00007E38
C:\Program Files (x86)\Steam\steamapps\common\FINAL FANTASY XIV Online\boot\ffxivsysinfo64.exe 000018E0
C:\Program Files\Intel\SUR\QUEENCREEK\x64\esrv.exe 00004E54
C:\Program Files\Logitech Gaming Software\ArxApplets\Discord\logitechg_discord.exe 00003410
C:\Program Files\Logitech Gaming Software\LCore.exe 000033D0
C:\Program Files\NVIDIA Corporation\NVIDIA GeForce Experience\NVIDIA Share.exe 00005944
C:\Program Files\NVIDIA Corporation\NvContainer\nvcontainer.exe 000083F4
C:\Program Files\Tablet\Wacom\Wacom_TabletUser.exe 00002D14
C:\Program Files\Webroot\WRSA.exe 00000090
C:\Program Files\WindowsApps\Microsoft.SkypeApp_14.40.70.0_x64__kzf8qxf38zg5c\SkypeApp.exe 00001B44
C:\Program Files\WindowsApps\Microsoft.SkypeApp_14.40.70.0_x64__kzf8qxf38zg5c\SkypeBackgroundHost.exe 000016C0
C:\Program Files\WindowsApps\Microsoft.SkypeApp_14.40.70.0_x64__kzf8qxf38zg5c\SkypeBridge\SkypeBridge.exe 000033D8
C:\Program Files\WindowsApps\Microsoft.Windows.Photos_2019.18114.17710.0_x64__8wekyb3d8bbwe\Microsoft.Photos.exe 00006590
C:\Program Files\WindowsApps\Microsoft.WindowsStore_11811.1001.18.0_x64__8wekyb3d8bbwe\WinStore.App.exe 00004A88
C:\Program Files\WindowsApps\Microsoft.YourPhone_1.0.20453.0_x64__8wekyb3d8bbwe\YourPhone.exe 0000217C
C:\Program Files\WindowsApps\Microsoft.ZuneVideo_10.19021.10411.0_x64__8wekyb3d8bbwe\Video.UI.exe 00003210
C:\Program Files\cFosSpeed\cfosspeed.exe 000032E0
C:\ProgramData\WRData\pkg\npwebroot.exe 00004538
C:\Users\JFVan\AppData\Local\Microsoft\OneDrive\OneDrive.exe 000036CC
C:\WINDOWS\Explorer.EXE 00001CD8
C:\WINDOWS\System32\svchost.exe 00002AC4
C:\WINDOWS\system32\ApplicationFrameHost.exe 00004D4C
C:\WINDOWS\system32\DllHost.exe 00004F74
C:\WINDOWS\system32\MicrosoftEdgeSH.exe 000003C0
C:\WINDOWS\system32\SettingSyncHost.exe 00001A54
C:\WINDOWS\system32\browser_broker.exe 00002AF8
C:\WINDOWS\system32\cmd.exe 000023D8
C:\WINDOWS\system32\conhost.exe 00003D94
C:\WINDOWS\system32\igfxEM.exe 00001E98
C:\WINDOWS\system32\sihost.exe 000018AC
C:\WINDOWS\system32\svchost.exe 00001FD0
C:\WINDOWS\system32\taskhostw.exe 00001A28
C:\Windows\ImmersiveControlPanel\SystemSettings.exe 000022E0
C:\Windows\System32\DataExchangeHost.exe 000065F8
C:\Windows\System32\MicrosoftEdgeCP.exe 00001DE0
C:\Windows\System32\RuntimeBroker.exe 0000835C
C:\Windows\System32\SecurityHealthSystray.exe 00001E0C
C:\Windows\System32\Speech_OneCore\Common\SpeechRuntime.exe 0000099C
C:\Windows\System32\smartscreen.exe 00003334
C:\Windows\SystemApps\InputApp_cw5n1h2txyewy\WindowsInternal.ComposableShell.Experiences.TextInput.InputApp.exe 000031D4
C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdge.exe 00000AC4
C:\Windows\SystemApps\Microsoft.Windows.Cortana_cw5n1h2txyewy\RemindersServer.exe 00002174
C:\Windows\SystemApps\Microsoft.Windows.Cortana_cw5n1h2txyewy\SearchUI.exe 00000ED4
C:\Windows\SystemApps\ShellExperienceHost_cw5n1h2txyewy\ShellExperienceHost.exe 00001EA8