Idunno what's with all the whining, v11.4 runs great.

Modded RX 580 Gaming X 8G getting 30.8 Mh/s ETH & 1.175 Gh/s XVG on Win 10, beta drivers with semi-conservative Claymore settings.
Using MSA to set fans at 38% for ~51c on all cards (plus 12V fans blowing through the GPUs), 68F ambient temperature.

Could dial things up or down for more or less power/hashes but things are solid, cool, and fast enough. Will tweak things again later.
Should be able to lower wattage by 10 to 15W or bump things up and get 31.25 Mh/s ETH, 1.3 Gh/s XVG and still be stable with reasonable temps but MEH, whatever.
(ETH only = 31.25 Mh/s all day long at -mclock 2200 -dcri 8, 48c, 30% fan. -mclock 2225 will do 31.5 but was slightly unstable after 10 hours.)

-etha 0
-estale 0
-dcri 38
-cclock 1215
-cvddc 925
-mvddc 925
-mclock 2200
-tt 59
-tstop 67
-ttdcr 63
-ttli 65
-ftime 10
-minspeed -120
-fanmin 35
-fanmax 55
-gser 1
-allcoins 1
-allpools 1
-dbg -1 (no need to log perfection)