Mid split upload speeds

I've been seeing posts from others and it seems they needed some configurations done on the back end to get that up and running. For reference, I'm on the 2.1/250 plan. My download speeds are fine, but my upload has NEVER been higher than 80mbps. Xfinity reps and store haven't been much help as ive has the xb8 replaced more than once but never fixing the issue. I know that expecting 250 up isn't realistic, but it feels like it should definitely be higher than 80.

My apologies if his isn't the correct place for this.