You are not looking at the hash rate, you are looking at the number of shares. Flash good timings for your cards, use linux-like OS. Maybe the Phoe...M..r is ​​not as bad as it seems.

Looks like CM as the project died, last visit of CM author to forum: Last Active forum: November 11, 2019, 06:37:41 PM

ps: my rx570  4 gb memory pached right now gives from 30.9 to 31.25 mh on a linux like os
GPU 5       Radeon RX 570 4096M · PowerColor            31.22 MH
07:00.0     Elpida EDW4032BABG 113-D0003400_100
GPU 6       Radeon RX 570 4096M · Sapphire                31.16 MH
08:00.0     Elpida EDW4032BABG 113-2E366FU-O53
GPU 7       Radeon RX 570 4096M · PowerColor            30.99 MH
09:00.0     Elpida EDW4032BABG 113-D0003400_100

Good luck