R9 280x 1070/1600 (ASUS) 0.39 CPD (WIN10, 17.12.2 driver)
RX 580 4gb 1366/1750 (Sapphire Pulse) 0.37-0.38 CPD (WIN10, blockchain driver)
RX 470 4gb 1206 or 1226/1750 (ASUS Mining Edition or XFX) 0.33 CPD (WIN10, blockchain driver)
I use 10.2 beta miner, because it was already downloaded on rigs, 10.2.2 beta miner gives the same results (tested on one rig), so i don`t update it on others.
10.2.2 give same results, but don't generate 4% invalid shares like previous miners.
Did you try windowSize = "8192"; for RX 580 and RX 570 ?