whats between this modem and the closest return amp? 30dBmV is way too low for US transmit. It should be up in the mid 40's. This could help explain the poor USSNR. The DS SNR and levels are whacked too. If your at +10 dBmV at 111 mHz, your analogs into this modem are at least 16 dBmV. Total input power into a modem should be no more than +17 dBmV for ALL CHANNELS together. You have way too much RF hitting this modem.
This is CABL.com posting #335234. Tiny Link: cabl.co/mbzna