cm1000v2 Xfinity speed dropped after install

Any feedback on the attached log files screen capture? Comcast will be on site today to check the line and looking for anything I can point out to the technicial. The power values for all downstream channels are negative. Is that the issue? Low signal power = only 30mbps of the 600mbps currently?

I don't know about splitters. We don't coaxle cable in the house except for thw cable modem and there's no splitter on the single cable between the modem and wall jack.

We've powered over several times and I connect one computer directly to modem ethernet with same low speed.