at lower voltage it will draw more amps for same performance
I think you are wrong. There is no DC/DC converter "inside" the chips

I concur I'm lost as to what this would be set at ideally or if it even matters between .9 and 1. The best response I've found is around .940 1640:70 into BFG. What do you set your cards at form?
Also wondering if anyone has interest in my jacked up card? Whatever is wrong with it isn't obvious, it connects to BFG miner but won't do any work. I know it isn't the ASIC's because I have 4 others assembled in the same manner. Anyway, I'm tired of messing with it.