I found another thread that helped me tweak my cards.

I am currently running four RX580 8gb MSI cards.

I bios modded card and set afterburner with the following settings.
Core clock is 1300
Memory clock is 2100

With these same settings I was getting 30.5 on single mining for eth. I restarted claymore and immediatly the hash dropped to 29.4.  I was running stable at 30.5 for hours.

I am trying to get back to 30.5

Any help would be appreciated.