Tried this miner) Tnx for a hard work

That's what I got at 0.9v (100W power usage)

RX 570 4Gb Nitro+ 1209/1875Mhz (Elpida) - 29.5Mhs (-i 24, 3Gb vram usage)
RX 570 4Gb Nitro+ 1209/2000Mhz (Hynix) - 30.5Mhs (-i 24, 3Gb vram usage)
RX 570 4Gb AORUS 1209/2000Mhz (Hynix) - 29.8Mhs (-i 23, 1.5Gb vram usage)

Also have RX 580 8Gb Strix at 1215/1925 (Samsung) and MSI RX 580 Armor 4Gb 1239/1970 (Hynix), both show around 33-34Mhs at start and after around 15min GPU clocks drop to 300-900Mhz and hashrate drops as well to 24-25Mhs. Voltage bump doesn't help.

All other algos like ETH/Cryptonight run for days with no HWInfo errors and clock drops. But this one causes errors to pop like crazy! Dunno how people get stable 33+ Mhs, i couldn't. Of course, modded bios.