Help! Hey Guys... A bit of a noob here, so greatly appreciate any help.

Setting up my 2nd and 3rd rig and decided to go with the RX580... Ended up with XFX RX580 8GB GTS Black Edition

Info on card:
http://xfxforce.com/en-us/products/amd-radeon-rx-500-series/rx-580-gts-8gb-dd-rx-580p8dbd6

I was only getting 18-19 hash rate out of the box... I can't get it past 20! From what I've read the 580's should be in the high 20's at least.

This was the best I could do... In ethOS I've updated the config...
Core: I've maxed out (according to specs) at 1425.
Memory: 2220

Is there anything else I should try?? Hoping to not have to return 10 GPUs...