I am having a similar issue I think. I get great hashrates in Windows 10 but they are cut in 1/2 in Hive OS. Were you able to fix?? Sapphire Pulse RX570 4G Elpida.
I verified that this is my problem as well. I am stuck in DPM 0 with core clock at 300 and mem at 300. If I run the wolf cmd I get errors saying that /sys/ dir doesn’t exist or that I’m not root. (which the login says I am) Any ideas??