Hey, anyone got a stable setting without BIOS modding for a MSI Armor RX 580 8gb??

I'm using the following on my dag:

-gt 0 -mt 1 -cclock 1200 -cvddc 900 -mclock 2080 -mvddc 925

and i'm getting 28,1 mh/s but my effective @ ethermine goes arround almost half of this..

Any ideia what that could be or if that's normal?