Ping spiking during peak load hours, uncorrectable codewords

For the past 3 weeks I have been trying to get this issue resolved by working with the local xfinity department, but thus far I've pretty much been told there is no issue. There have been several technician visits, but they refuse to come out and check the line while the issue is actually happening because it is outside of their work hours. They come out during the day, check the signal, say its good and leave. They have tried to place a "watch" on my modem, but they are telling me the watch is reporting that there are no issues. This has got to be a straight up lie, as evidenced by the screenshots. The supervisor for this area has even come out and essentially said there appears to be no issue. At this point I feel like they're trying to gaslight me until I give up.

Anyways, onto the actual issue. During peak load hours, I get ping spikes that make gaming/real-time applications mostly unusable. These spikes can range anywhere from 40ms to 500ms on average. These spikes occur regularly until roughly 10pm. I have ping plotter and traceroutes that I have attached to this post to show the extent to which this happens.

I have also logged into my modem and kept a watch on the uncorrectable codewords; on channels 34 through 44, there have been over 900 codewords (on each) over the course of a week. I have attached a screenshot of that as well.

If this issue is not resolved soon, I will have to file a formal complaint with the FCC. I see no other possible course of action. I have no other ISP options in my area.

Thanks in advance for the help anyone on this forum can provide.

EDIT: Can't seem to find a way to attach images to this post. So I may need to get some imgur links.

Ping to google.com via CLI: https://imgur.com/a/FQLYCxJ

Ping plotter (google.com): https://imgur.com/a/BqDXbOu

Codewords/router power/channels: https://imgur.com/a/LWP3ESg