if I could attain another 32kbps or two on a line, it would push me up to the magic 2272 ds sync which is the threshold for BTW 20CN IP Profile 2000 instead of 1750
Can/have you tweaked the target SNRM of your modem(s) that is what I do to gain either stability (get as close to 6240 kbps) or speed (get just above 6816 kbps).
What does your SNRM drop to at its lowest at night ?
Do you monitor your modem(s), or because they are in modem only mode behind your firebrick it is too difficult?
I can monitor the stats on my modems, because A&A's servers can interrogate them, god knows how, remotely and get sync rate, SNRM, all the stuff I need. I check on them all once a week or so. SNRM doesn't drop much at night, below 6dB to 5 occasionally. Sometimes it is 7dB all day.
As for issuing tweaking commands to all the modems, experience suggests that that would be a step too far. I've had a bad experience (documented in an earlier thread, where?) where ds sync at 2240 or similar was basically too high and needed to be reduced (by a short off-on, luckily) slightly which brought a huge ES rate down to zero for the loss of a few k ds sync (which equals zero as it's in the same band).