I have a xfx 570 8gb (samsung memory), bios flashed, 1150 core clock - 2000 memory clock - 850 mv, most recent driver. Was expecting to get 30mhs, or at least 29, yet only getting around 27.82 https://i.imgur.com/FkrL74g.png.

Does someone know what could be? Such as maybe my bios flash wasn't so optimal, or I'm not tweaking the miner the way I should (i'm not tweaking it all, it's running on auto-tune)
Would appreciate suggestions.