El Dorado Hills, CA
The signal looks a bit hot (both on US and DS), but unless the downstream power is swinging up a few dBmV, it shouldn't be an issue.
If you have a splitter, you could probably throw the cable modem on the -7dB leg and then your DS power would be closer to 1-2 dBmV and your US power would still be quite good at ~42-43 dBmV.
It could be your upstream SNR causing the problems. You may want to call in and ask what it is and see if there are any upstream noise issues, because those signals (while hot) don't look that bad.
"I drank what?" -Socrates