So a summary of my issue:

I've had service at my current address for the past 2-3 years. For the past 2 weeks, I've been experiencing intermittent outbound packet loss, primarily during peak usage hours (9pm - 2am EDT when it's almost constant), but the issue happens throughout the day at random intervals. Spikes of up to 40% packet loss (using Teamspeak's connection info as a basis) are fairly common; with the average loss over a sustained period of time being closer to 5-15% (spikes to 20-40%, then falls and maintains at 5-15% for a period of time. This is also accompanied by service degradation on a gigabit service to speeds of around 100-150Mbps down, and as little as 3 Mbps up while testing from the xfinity website.

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Steps I've already taken:

Restarted Modem

Power Cycle

Replaced modem

Replaced interior cabling

Wired directly into modem

Contacted support once(twice, if you count the time they told me to just get a new modem)

Had one tech come out who replaced connectors during the middle of the day while the issue wasn't present. The issue is still occuring.

Ensured the issue isn't with a particular server, game, or application (it happens globally)

Ran a traceroute and think I've pinned it down to one of the first two nodes outbound by pinging my IP from remote locations. Losses from remote locations while the issue is present seem to happen 1-2 stops away from my location, but I know nodes de-prioritize some traffic when pinged directly.

Ran a prolonged -t ping to comcast's website, noting similar levels of packet loss

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What I need to know:

What should I do from this point? I think it's safe to say at this point that I'll eventually have to get someone to monitor my connection for a prolonged period (at minimum, overnight) in order to get enough data to correct the issue. I'd really rather not go back and forth with customer support a half dozen times being told to power cycle / replace my modem. Is there an avenue I can take to get in contact with someone at a high enough level of technical knowledge/authority to assist me?