Nice stuff here man!! Glad this session went better than the last one. The single PCB 295 clocks lower probably because one PCB w/ 2 gpus gets hotter, as do all the other components. What were your loaded temps like?
I find when I start losing MHz in clocks and cant run at same speeds anymore, its usually condensation. I call it quits and tear things down and figure out if theres any water. If not then back to benching