Try 1150/1750, so memory will be stock. No sense to reduce core(core can provide wrong results as I remember only on Vega).
DEFAULT/STOCK IS 1350/2000--
I tried 1150/1750 and the hash rate dropped to 1.6MH/s per GPU, ~10MH/s for the rig. After changing the configuration to 1150/2000 and rebooting, the rig seemed to behave well. While I was outside it was mining ok at 1100/2000 clocks, with 345 accepts and 6 rejects at 11.5MH/s for the rig.
Currently, the rig shows 100 accepts with 1 reject at 1150/2000, and the rig is hashing at 11.75MH/s. It has been mining for about 40 minutes. Maybe it can be pushed harder somehow, but it seems ok. The wattage per card is less than 90W in the console report. --scryptr