Currently using grin gold miner on my 3x Vega 56 rig. Each card is mining between 3-3.1 total of 9.3 hs for the entire rig, consuming 450w @the wall.  All cards using the latest AMD bios and the same settings i use the same settings i use to run xmr mining for all the cards. I messed with the settings a little bit and I upped the core clock speed from -14% to 0% and got a little bump. Feels like maybe these cards could be pushed more but will try messing with them throughout the week.