Maybe the ATX power is helping error rates. I'm getting 6 / 406 now, or about 1.5%. Much lower than last night on the wall wart, about 5%. Neither makes me happy but this is starting to get into a decent ball park.
Now tell me again how to calculate this properly using non 1-diff shares? I can't see a total count that includes difficulty accounted for. I know the git version now counts 1-diff shares, but is there a place to find that count on 3.3.1?