Bufferbloat on XB8-T, Nothing Fixing

I've been experiencing bufferbloat on my XB8-T gateway, with seemingly no fix. Wired or wireless, different devices, etc. My most recent bufferbloat test on Waveform was a B, right on the edge of a C. I work from home in a position where I almost entirely telecommunicate with clients. I constantly am having freezes and drops due to the bufferbloat. I've done all of the basic troubleshooting- resetting both wifi and device hardware, making sure drivers/software/firmware is up to date, running built-in Xfinity troubleshooting, speaking with the Xfinity Assistant, etc.