RX580 8GB trouble

Hello duds,
i’m having a problem with two RX580 8GB power color red dragon (micron memory) https://forum.hiveos.farm/uploads/editor/ee/j82llv7kqjyc.png
in a hibryd rig with gtx1070ti, gtx its ok with hash’s but rx having a problem! I’m having trouble setting up OC, my hash’s can’t up more then 27,8 on both…