I have 6x Sapphire Nitro RX 580 4GB cards that are currently modded with the new rom that I made. I only changed the 1:2000 straps with the 1:1750. After saving and flashing with ATIWinFlash and rebooting, I did run claymore dual mining again to see if I could get more than 24.5 mh/s but seriously nothing changed much! Anyone facing the same problem?