Ok I got some help and found out there was an issue with HiveOS and Vegas using TRM and amdmemtweak. It got fixed on the back end for me and supposedly goes out in an update soon. Changed hash rate significantly so it's much more in line with expectations. Figured I'd give my ending values in case they help anyone else.
amdmemtweak –CL 20 --RAS 26 --RCDRD 12 --RCDWR 12 --RC 38 --RP 12 --RRDS 3 --RRDL 5 --RTP 6 --FAW 12 --CWL 8 --WTRS 4 --WTRL 9 --WR 13 --REF 12000 --RFC 239
I'm at 46 Mh/s on my RX Vega 56 Samsung with stock bios and down clocked 940mhz core, 850mv, 950mhz mem. Pulling 1020 watts from the wall with a 6 GPU rig.
It seems we have very similar cards, the defaults timings where almost identical.
Mine is a Gigabyte Vega56 8Gb Samsung Memory.
With your timings I'm getting 44.0MH/s on PhoenixMiner in Windows10 Running Core 940Mhz@875mV and Memory 950MHz@900mV... Phoenix reports 183W consumption with 49ºC Temps and 3000RPM Fan
Did you further tweaked your timings? I had no luck running the card with higher memory clocks, and don't know how to reduce further the power draw...