Can someone help with rx480 overclocks

I’m running Hive OS and using teamredminer. If I use any overclock settings other than the below configs, my cards crash. I’m only getting about 53 MH/s on 6 cards. This seems pretty low to me, but have not been able to boost performance any.

Only settings I configured are these: Core: 1040 DPM: 1 MEM: 1480

Can anyone assist?

Thanks!