Reporting Latency Related Issue (NA Data Center)

[Taimara]

Name of your Internet Service Provider (ISP): Comcast
Ticket or reference number from your ISP. None, they say there is no issue on their end.
State/Country: Oregon, USA
Date/Time (When did the issue start happening, at what specific times does this issue arise, if any.) 3:30pm PST (December 4th)
Frequency (How often does the issue occur?) 5th time in the last 30 minutes.
Content (Which content were you playing in-game when the issue occurred?) Standing around in Ishgard
Which in-game World were you playing on when the issue occurred? Siren
Traceroute records (optional) (Learn how to generate traceroute record):

First 5 hops had no issues.
6 17 ms 14 ms 11 ms 4.68.62.201
7 140 ms 209 ms 230 ms 4.69.153.86
8 271 ms 120 ms * 4.69.153.86
9 86 ms 85 ms 86 ms 4.59.178.74
10 86 ms 83 ms 81 ms 192.34.76.10
11 83 ms 83 ms 83 ms 199.91.189.242
12 84 ms 82 ms 82 ms 199.91.189.74

[Zweihander01]

Name of your Internet Service Provider (ISP): Comcast/Xfinity
Ticket or reference number from your ISP: Not bothering because it's not them for once
State/Country: PA USA
Date/Time: Seems to begin during the evening, though I don't have data for earlier than this.
Frequency: Every day since about a week ago.
Content: Duty instances are where I started noticing it. The first time it happened I completed a Void Ark run without issue but the EXDR I did right after it was laggy as heck. Since then it's been the same for a few hours every night.
Which in-game World were you playing on when the issue occurred? Excalibur, the IP I'm using in tracert is 199.91.189.38 which I got from http://arrstatus.com/
Traceroute records: I've added them to this gist and may update it https://gist.github.com/johnspivak/04f261030a91d60fc818 But I'll quote the relevant parts for you:

  5    13 ms    14 ms    14 ms  be-33287-cr02.newyork.ny.ibone.comcast.net [68.86.93.173]
  6    12 ms    13 ms    77 ms  ae12.edge1.NewYork2.level3.net [4.68.127.1]
  7   110 ms    89 ms   220 ms  ae-11-11.car2.Montreal2.Level3.net [4.69.141.1]
  8   221 ms    42 ms   210 ms  ae-11-11.car2.Montreal2.Level3.net [4.69.141.1]
  9    20 ms    20 ms    19 ms  ORMUCO-COMM.car2.Montreal2.Level3.net [4.59.178.74]
 10    38 ms    37 ms    37 ms  192.34.76.10

The real puzzler here is why it's hopping from ae-11-11.car2.Montreal2.Level3.net [4.69.141.1] to... ae-11-11.car2.Montreal2.Level3.net [4.69.141.1], the same IP.