I tried this on a powercolor VEGA 64.
Getting a stable 2050Hs for the last 12 hours now, which is more profitable than the 44.2Mh this card does on ETH.  Its submitting and being accepted at Nicehash just fine.

Settings
Core -30% (1150mhz) (no difference in hash all the way upto 1800mhz)
Mem 1100
Power limit +50%

Strings used (after the usual site and wallet) -G 1 -I 7
intensity at 7-9 are all the same hash rates so left at 7. I didn't need the --nicehash addon to make this work.

The system has another card as GPU0 which is mining ETH/LCR on the NiceHash Legacy software just fine alongside this.

HWinfo says about 120W core. Which is the same setting and power usage as I use on Claymore for 44.2Mhs on ETH.
The card is water-cooled with a EK full cover and running at 45C.

Now to see how stable this is over the next month or so.