From my analysis of the modem stats you kindly provided, the downstream power's a touch on the high side, and the upstream power's a touch low. Downstream ideally should be around 0 dBmV. Upstream should ideally be anywhere between 40 and 50 dBmV, but can be as low as mid-30s. Somebody more qualified than me can either throw out what I said or back it up with a solution.