Vega 56/64 hashing too low on cryptonight-heavy(SUMO)
I have two AMD cards, an AMD RX 580 and AMD RX Vega 56. Both perform great on cryptonight and cryptonightv7(~850h/s and ~1850h/s). The issue is the with Vega when mining cryptonight-heavy SUMO. First I noticed I had to change(lower) the intensity considerably on the Vega to get the miner to work but then the hash rate wont go over ~1200h/s on the other hand the 580 works perfectly having same hash rate than the other 2 algorithms without changing settings. I double checked this issue with a friend having a Vega 64 rig and he had the same issue than my Vega 56 one.

I tried the latest version and also tried compiling the latest source code having the same issue.