How many of the Bitmain APW3's have you tried out? Through my testing I have 1 remote connected to a APW3 and one now at my place connected to an APW3 and not having issues with them.
What way are you testing the APW3 to determine they are coming up short? I have been testing by running the units with them so wanted to what tests you were using to get this. Just trying to compare as we seem to be getting different results.
I have personally purchased and have been using 30 of the Bitmain PSUs with no issues so far. The rest of my miners have been on rental PSUs. I would say that over the time of 9 months is a very good track record.