You live near me, and I am having a similar issue. I have been talking to twc for over a month and a half, have had the cable drop to my house replaced, and got a new modem. The 2 techs I had out here on the 10th said they would have line maintenance come out on Monday(to check the lines on the poles). He gave me the number for his supervisor if that still doesn't fix the issue.
Here are some of my outbound MTRs. Notice the extremely high "Worst" values. These happen for a second or less, just enough to interrupt gameplay.
I have had TWC out here 4 times for this issue, thankfully I think I will get somewhere after Line Maintenance comes out today. I plan to contact the techs supervisor around Wednesday.
The issue can be measured inbound to my home as well:
Hopefully when I get mine fixed, it will be fixed for you too.
Do you have access to a Linux machine on your LAN? The MTR tool for Linux is much better IMO.