Dunno if it's of any help to fix unstable hashrate but I settled on this config for rx570 4gb (880-910 per card).
{ "mode" : "GPU", "worksize" : 8, "alpha" : 64, "beta" : 16, "gamma" : 4, "delta" : 4, "epsilon" : 4, "zeta":4, "index" : 1, "multi_hash":448 },
{ "mode" : "GPU", "worksize" : 8, "alpha" : 64, "beta" : 16, "gamma" : 4, "delta" : 4, "epsilon" : 4, "zeta":4, "index" : 1, "multi_hash":448 },
And the same but multihash 992 gives me 1830-1870 from vega56. 11.1kh from 6 gpu rig. 1014watts. That rig has been working for 24 hours and hashrate drop was insignificant (10.9kh). But the other rx vega rig works best with multihash 960. I may be wrong but looks like both threads have to have equal multihash and that was not the case in the previous versions.
Big thanks for this great miner!
Those settings are not good for my Vegas Hevy. One of the cards got only 150-180h/s. Always the same.
but...
{ "mode" : "GPU", "worksize" : 8, "alpha" : 64, "beta" : 16, "gamma" : 4, "delta" : 4, "epsilon" : 4, "zeta":4, "index" : 1, "multi_hash":976 },
than I can squeeze 2080+h/s @ 220W from the wall. So it is faster than I can get V8.
Get rid of the instability problem and will be great.
Great miner!!!