Persistent Packet Loss at ibone.comcast.net + Telia Transit congestion: nightly gaming lag, Boulder 80303. Request Engineering Escalation

I am experiencing persistent nightly packet loss and latency spikes when gaming, specifically between 10pm-1am. I have documented this with PingPlotter (screenshots attached) and identified two distinct issues:
Issue 1 -- Xfinity backbone packet loss (your network, your fix): Issues are consistently worse during evening peak hours (approximately 6pm-11pm), which strongly suggests node oversubscription. Friends on fiber experience zero issues in the same gaming sessions simultaneously.
Hops 7-8 in my traces consistently show 4-12% packet loss at:

96.110.43.245 -- be-36021-cs02.1601milehigh.co.ibone.comcast.net

96.110.33.122 -- be-3311-pe11.910fifteenth.co.ibone.comcast.net

This packet loss appears even at 3am off-peak hours, meaning it is not purely congestion-related.

Issue 2 -- Telia transit congestion (routing decision you can change):
I believe my traffic exits Xfinity's backbone through Telia Carrier (62.115.x.x / twelve99.net) to reach game servers. A neighbor on Quantum Fiber experienced identical lag spikes at the same time as me on the same game server, while a third neighbor, also playing on the same game server, was unaffected. This confirms the congestion is at a shared upstream transit point, not ISP-specific infrastructure.
Xfinity has the ability to reroute gaming traffic away from the congested Telia transit path. I am requesting:

1. Engineering investigation of packet loss at the 1601 Mile High and 910 Fifteenth Street Denver PoPs

2. Review of Telia transit routing for gaming traffic out of Boulder 80303

Tier 2 / Network Engineering escalation -- not a modem reboot

PingPlotter data: