Hey matt_31
I work for Comcast in St. Paul, MN. The ideal level for our modems is around 0dBmV, but they work great anywhere from 0 to -10. Levels like yours can cause very slow speeds on our modems. My level is -3, and before tweaking, I tried a 6dB pad to see if that was the problem, but no go. You might try a 3-way splitter as cableguy said, or get ahold of a couple different pads, and try those out. If that doesn't work, I'm sure VanBuren can help you out with tweaking. Good luck!