The current upstream ES rate tends to be around 100-200 ES/hour between about 18:00 and 07:00 which means that the 24 hour total is potentially going to cause interleaving (on TTB with an expected 1440ES/day limit).
I don't know if we should assume that upstream has the same thresholds. I guess we get to see when the day comes that you leave it powered up.
All that I have found to do to minimize the errors is an upstream speed cap of 16Mb/s . That seems to maximizes the upstream power and SNRM, capping to a lower speed values leads to a drop power and less SNRM. The DSLAM seems to adjust the upstream power and seems reluctant to allow too high a value of SNRM.
There's a thing known as "upstream power backoff" which is generally used to reduce power of those close to cab, so their signal doesn't swamp that of the distant users, which would cause too much crosstalk upstream, and needlessly lose their bandwidth.
I haven't looked into the algorithms used by UPBO, but looking for high SNRM might well be the way it works.