Running it on rx580 8gb, i got 8.6Kh@128W or 8Kh/s@109W downvolting.
Been messing with one of mine... But RX570 4gb L16+16 and seem to be running 8.2 khs.
I haven't found any better combos than that for the config.
JCE CN GPU miner is still faster then.
Except for my bad GPU (MSI Gaming), my 574s get +/- 8,5KH/s.