packet loss fix

For the better part of 5 years my internet has had packetloss most of the day making gaming and even streaming impossible at times. Multiple techs and router/modem swaps later it still isnt fixed. One of the techs mentioned about having to check something out on the pole but didnt have the equipment to do so and it never got done. Each tech has said everything looks fine, the internet is good for maybe a day and then problems return. I have port forwarded game servers for every game i play and while it helps the tiniest bit, it is still unplayable. Rubber banding around, internet dropping for a split second resulting in a disconnect from the game for a few seconds. Every game that has the telemetry viewable shows 1-5% packet loss, spiking to 100% when disconnects happen. Meanwhile download/upload speeds are both consistent, but packet loss is a HUGE problem and has been since upgrading to the highest speed package. I've been dealing with it hoping something was happening with techs that unfortunetly seem like they only know how to install a coax into modem.

Doesnt matter if theres one device connected and using bandwidth or five, packet loss packet loss packet loss...

XB8 Modem/router combo 

Multiple ethernet connected PC's have this issue. Multiple ethernet cords ranging from cat 5, 5e and 6. 

2.5Gb port (with 2.5Gb port on PC) and 1Gb ports were tried

Hopefully someone can help me remotely as I believe its on comcast/xfinity's end and techs coming and going and resolving nothing isn't gonna fly anymore.