I have a stable 30.3 Mhs or better had because my colleagues have turned their mining rigs off, I was managing the rigs for them.
I had 30.3 on Sapphire Nitro Plus on 1150 and 2150 at 127-130 watt for each card. I know it may not be impressive but keep in mind Nitro Plus versions always consume a bit more than other versions so those numbers were really good.
Samsung mem? What straps? How did you measure power per card? How many memory errors per card with 30.3MH/s?