SRB on my RX 580 8Gb cards (hynix) gives on 1 card 10 h/s more than GGS, but 2nd card 10 h/s less ))))
But GGS is open source... Thats mean that devfee can be disabled on them...
If you want anything to be actually developed on, then pay the damn devfee.
Removing it will stop development which is NOT what we want!