I have 2 powerfull cards on rig and 2 low end.
So if i mine ETH + DEC on one miner window with better cards i get 2% fee and low end cards own miner window 1% fee...
So 3% fee on 99mh ETH and 880mh DEC. So there is no point to mine on this miner...
3% fee - you have serious problems with arithmetics. Assume you have 6 cards and open 6 miner windows - will you calculate fee as 6%?

Anyway, don't use my miner if you think that you earn less with it.