I have rig with 6x570 and 8x580 in simplemining, unfortunately only with 4gb all.
Gigabyte RX 570 4GB
1150/2050
900mV 14.32 MH/s
97 W 74°C / 41%
Someone got more than 17mh to a card?
Doesnt matter we are within a few weeks of 4gb cards not being able to mine ETH. It is coming and inevitable. Ive got a few 4gb rigs still able to mine 17-18.5mhs but in 15.5 hours it will drop again. And ever 4.5days after that until

570s
1145/2100/825
Good config... @divan0W probably can reduce a little bit the Core Voltaje and increase the memory ... if it is stable.