Your Core and Memory Control are way out of desired values. Try P7 1150/850 and P3 940/825 first, than try to play with timings.
EDIT: Huh, also decrease temp limits or upper fan curve keeping memory temp in 60-65 degrees range.
Wow, the P7 and P3 settings pushed it to 42 MH/s! Thanks a lot!
I have no idea what to try in timings, as i dont understand the technical background. Any suggestions?
42...
Non modded vega56 on mmpos....53.19mhs core 1090 / mem 1020 / vlt 0.835 130watts.