Frequent "Interrupted" Spellcasting

Date & Time: Many times ever since Patch 4.3
Frequency: Very often, 2-5 times per battle.
World name: Lamia
Character name: Maeka Blazewing
Retainer name: None
NPC name: N/A
Monster name: Phantom Train, Chantook Demon, pretty much every boss I've fought since the latest patch.
Class/Level: WHM70
Party or solo: Party
In-game time: Varies
Area and coordinates: Sigmascape
Housing: N/A
Steps:
1. Move to avoid an AoE.
2. Stop.
3. Immediately try to cast a spell.
4. Spell is interrupted 0.10 - 0.20 seconds into the casting and triggers the Global Cooldown, forcing me to wait a moment before trying to cast again. As a Healer, this means that people will sometimes nearly die (or die outright) before I can heal them.
*Add more steps if necessary

Additional Notes: I've tested my pings to Google and I get 34ms, and I've tested pings to XIV servers and they are 100ms or less every time I've tested them.

Connection Specs
- Type of internet connection/provider: Comcast XFinity (Fibre) (250Mbit Down/12Mbit Up)
- Modem maker/model number: Comcast

■ PC Specs

CPU: Ryzen5 1500X
Mobo: ASUS AB350 Gaming-3
RAM: 16GB 2400
GPU: GeForce 1050Ti

To obtain the system information, open the FFXIV launcher and select Config → System Information → Display.

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


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

MyDocument C:\Users\Jeff\Documents
ProxyEnable 0
ProxyServer unspecified
ProxyOverride unspecified


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

SYSTEM_OS Windows 7 Home Premium 64-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_ldr_escrow.180422-1430)
SYSTEM_CPU AMD Ryzen 5 1500X Quad-Core Processor (8 CPUs), ~3.5GHz
SYSTEM_CORE_NUM SYSTEM_CORE_LOGIC 8 SYSTEM_CORE_PHYSICS 4
SYSTEM_BIOS BIOS Date: 02/06/18 14:30:48 Ver: 05.0000D
SYSTEM_LANGUAGE English (Regional Setting: English)
SYSTEM_MEMORY 16335.320MB
SYSTEM_VIRTUAL_MEMORY 8388607.875MB
SYSTEM_PAGE_FILE 32668.809MB
SYSTEM_STORAGE C:\ SYSTEM_HARDDISK_DRIVE SYSTEM_TOTALDISC_SPACE 931.413GB SYSTEM_FREEDISC_SPACE 555.006GB
SYSTEM_DIRECTX_VERSION DirectX 11
SYSTEM_GRAPHICS NVIDIA GeForce GTX 1050 Ti
SYSTEM_GRAPHICS_DEVICE \\.\DISPLAY1
SYSTEM_GRAPHICS_CHIP GeForce GTX 1050 Ti
SYSTEM_GRAPHICS_MAKER NVIDIA
SYSTEM_GRAPHICS_VRAM 3998.438 MB
SYSTEM_GRAPHICS_SHARED_VRAM 7911.660 MB
SYSTEM_GRAPHICS_DAC Integrated RAMDAC
SYSTEM_GRAPHICS_DISPLAY_MODE 1360 x 768 (32 bit) (60Hz)
SYSTEM_GRAPHICS_DRIVER nvd3dumx.dll,nvwgf2umx.dll,nvwgf2umx.dll,nvd3dum,nvwgf2um,nvwgf2um
SYSTEM_GRAPHICS_DRIVER_VERSION 24.21.0013.9731
SYSTEM_GRAPHICS_DRIVER_DATE 4/23/2018 4:12:56 PM
SYSTEM_GRAPHICS_DRIVER_LANGUAGE English
3.0
SYSTEM_GRAPHICS_PIXEL_SHADER 3.0
SYSTEM_GRAPHICS_VERTEX_TEXTURE SYSTEM_SUPPORT
SYSTEM_SOUND Speakers (Logitech G430 Gaming Headset)
SYSTEM_SOUND_DEVICE_ID {9A9F188D-FF42-446C-BA99-F2EAF93FDE81}
SYSTEM_SOUND_DEVICE_NAME USBAUDIO.sys
SYSTEM_SOUND_DRIVER_VERSION 6.01.7601.18208
SYSTEM_SOUND_DRIVER_LANGUAGE English
SYSTEM_SOUND_DRIVER_DATE 7/12/2013 6:40:58 AM
SYSTEM_SOUND Realtek Digital Output (Realtek High Definition Audio)
SYSTEM_SOUND_DEVICE_ID {2A55E458-20E3-4F0F-BFED-E7F46892B21C}
SYSTEM_SOUND_DEVICE_NAME RTKVHD64.sys
SYSTEM_SOUND_DRIVER_VERSION 6.00.0001.8040
SYSTEM_SOUND_DRIVER_LANGUAGE English
SYSTEM_SOUND_DRIVER_DATE 1/12/2017 9:38:54 PM
SYSTEM_SOUND E291-A1 (NVIDIA High Definition Audio)
SYSTEM_SOUND_DEVICE_ID {5B7C43E3-FBAF-4742-B77A-C2C249339B66}
SYSTEM_SOUND_DEVICE_NAME nvhda64v.sys
SYSTEM_SOUND_DRIVER_VERSION 1.03.0037.0001
SYSTEM_SOUND_DRIVER_LANGUAGE English
SYSTEM_SOUND_DRIVER_DATE 4/11/2018 11:28:20 PM
SYSTEM_INPUT {6F1D2B60-D5A0-11CF-BFC7444553540000}
SYSTEM_INPUT_NAME Mouse
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 3 SYSTEM_GAMEPAD_BUTTON 5 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 {9C1FF790-4BB3-11E8-8001444553540000}
SYSTEM_INPUT_NAME Logitech G430 Gaming Headset
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 0 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {A7E61BC0-545C-11E8-8001444553540000}
SYSTEM_INPUT_NAME MP-8888 USB Joypad
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 4 SYSTEM_GAMEPAD_BUTTON 12 SYSTEM_GAMEPAD_FOV 1
SYSTEM_INPUT {9C486720-4BB3-11E8-8002444553540000}
SYSTEM_INPUT_NAME Razer Naga 2014
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 573 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {9C486720-4BB3-11E8-8003444553540000}
SYSTEM_INPUT_NAME Razer Naga 2014
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 3 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {9C486720-4BB3-11E8-8004444553540000}
SYSTEM_INPUT_NAME Razer Naga 2014
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 1 SYSTEM_GAMEPAD_FOV 0
SYSTEM_INPUT {9C486720-4BB3-11E8-8005444553540000}
SYSTEM_INPUT_NAME Razer Naga 2014
SYSTEM_INPUT_REMARKS SYSTEM_GAMEPAD_AXIS 0 SYSTEM_GAMEPAD_BUTTON 1 SYSTEM_GAMEPAD_FOV 0


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

FFXIVLauncher
SimpleMU - [2 Taps]
SimpleMU
Steam
In-Game Bugs - Post New Thread - Mozilla Firefox
#dev - Discord
Chucklefish Forums - Mozilla Firefox
Paladin_790 - Chat


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

Adobe Flash Player 29 ActiveX
Adobe Flash Player 29 NPAPI
Battle.net
Mozilla Thunderbird 52.7.0 (x86 en-US)
Mozilla Maintenance Service
Notepad++ (32-bit x86)
NVIDIA Stereoscopic 3D Driver
OBS Studio
SpeedFan (remove only)
StarCraft II
Steam
WinCDEmu
World of Warcraft
Microsoft Visual C++ 2013 Redistributable (x64) - 12.0.30501
Microsoft Visual C++ 2013 x86 Minimum Runtime - 12.0.21005
Microsoft Visual C++ 2012 Redistributable (x86) - 11.0.61030
Java Auto Updater
Microsoft Visual C++ 2015 x86 Additional Runtime - 14.0.24215
AMD System Monitor
Microsoft Visual C++ 2005 Redistributable
OEM Application Profile
Microsoft Visual C++ 2005 Redistributable
Update for Microsoft .NET Framework 4.7.1 (KB4054852)
Update for Microsoft .NET Framework 4.7.1 (KB4054981)
Update for Microsoft .NET Framework 4.7.1 (KB4074880)
Update for Microsoft .NET Framework 4.7.1 (KB4096418)
Microsoft Visual C++ 2008 Redistributable - x86 9.0.30729.6161
OpenOffice 4.1.5
Microsoft Visual C++ 2012 x86 Additional Runtime - 11.0.61030
Microsoft Visual C++ 2015 x86 Minimum Runtime - 14.0.24215
Microsoft Visual C++ 2012 x86 Minimum Runtime - 11.0.61030
Microsoft Visual C++ 2012 Redistributable (x64) - 11.0.61030
Microsoft XNA Framework Redistributable 4.0 Refresh
Microsoft Visual C++ 2015 Redistributable (x64) - 14.0.24215
Microsoft Visual C++ 2015 Redistributable (x86) - 14.0.24215
Microsoft Visual C++ 2010 x86 Redistributable - 10.0.40219
Realtek High Definition Audio Driver
Microsoft Visual C++ 2013 Redistributable (x86) - 12.0.30501
Microsoft Visual C++ 2013 x86 Additional Runtime - 12.0.21005
AMD Software
CCleaner
Git version 2.17.0
Microsoft Security Essentials
Mozilla Firefox 60.0.1 (x64 en-US)
Mozilla Maintenance Service
Warframe
FINAL FANTASY XIII
FINAL FANTASY VII
Rabi-Ribi
Stardew Valley
Dragon Age: Origins - Ultimate Edition
Vulkan Run Time Libraries 1.1.70.0
wufuc
AMD Software
Microsoft Visual C++ 2010 x64 Redistributable - 10.0.40219
Java 8 Update 171 (64-bit)
Microsoft Security Client
Malwarebytes version 3.5.1.2522
Microsoft Visual C++ 2012 x64 Additional Runtime - 11.0.61030
Microsoft Visual C++ 2015 x64 Minimum Runtime - 14.0.24215
Microsoft Visual C++ 2008 Redistributable - x64 9.0.30729.6161
Canon MF230 Series
Microsoft Visual C++ 2013 x64 Additional Runtime - 12.0.21005
Microsoft .NET Framework 4.7.1
Microsoft Visual C++ 2013 x64 Minimum Runtime - 12.0.21005
NVIDIA Ansel
NVIDIA 3D Vision Driver 397.31
NVIDIA Control Panel 397.31
NVIDIA Graphics Driver 397.31
NVIDIA GeForce Experience 3.13.1.30
NVIDIA 3D Vision Controller Driver 390.41
NVIDIA PhysX System Software 9.17.0524
NVIDIA Update 31.1.10.0
DisplayDriverAnalyzer
NVIDIA SHIELD Streaming
NVIDIA HD Audio Driver 1.3.37.1
NVIDIA Install Application
NVIDIA Backend
NVIDIA Container
NVIDIA TelemetryApi helper for NvContainer
NVIDIA LocalSystem Container
NVIDIA Message Bus for NvContainer
NVIDIA NetworkService Container
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 3.13.1.30
NVIDIA SHIELD Wireless Controller Driver
NVIDIA Update Core
NVIDIA Virtual Audio 4.04.0
Microsoft Visual C++ 2012 x64 Minimum Runtime - 11.0.61030
Microsoft .NET Framework 4.7.1
Microsoft Visual C++ 2015 x64 Additional Runtime - 14.0.24215


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

C:\Games\Steam\Steam.exe 00000FD8
C:\Games\Steam\bin\cef\cef.win7\steamwebhelper.exe 000012E4
C:\Games\Steam\steamapps\common\FINAL FANTASY XIV - A Realm Reborn\boot\ffxivlauncher.exe 000002F0
C:\Games\Steam\steamapps\common\FINAL FANTASY XIV - A Realm Reborn\boot\ffxivsysinfo64.exe 000014E4
C:\Program Files (x86)\Common Files\Java\Java Update\jusched.exe 00000C54
C:\Program Files\Canon\Canon MF Network Scanner Selector\CMFNSS6.EXE 00000B1C
C:\Program Files\Microsoft Security Client\msseces.exe 000008E0
C:\Program Files\Mozilla Firefox\firefox.exe 000010E8
C:\Users\Jeff\AppData\Local\Discord\app-0.0.301\Discord.exe 0000146C
C:\Windows\Explorer.EXE 00000B34
C:\Windows\system32\Dwm.exe 00000BF0
C:\Windows\system32\taskhost.exe 00000BB0

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-


Laptop Model Name: N/A
Laptop Model Number: N/A

Gamepad Manufacturer: N/A
Gamepad Model Name: N/A
Gamepad Part Number: N/A

Browser Information
- Name and version of the browser currently in-use: Firefox (newest)
- Internet Explorer Version: Unknown

------------------------------------------------------

Information About the Peripherals You Are Using
-Type: Keyboard (Microsoft Natural) Mouse (Razer Naga)

Maybe you're experiencing packet loss that's not occurred for you before, but it's always been this way, even when the datacenters were in Canada. I can't speak for others, but I have adjusted to it over time and by default wait ~400ms after moving before casting anything.