I'm running 280x. I get

ETH@18.x MH + SC@220 MH with DCRI 35.
ETH@17.x MH + SC@420 MH with DCRI 50.

That's major improvement for small ETH drop. There's no reject.

I've put two rigs to mine ETH + Solo SC. The problem I'm getting now is that there is no shares being submitted but I can see my SIA GUI block height increasing. I'm not sure if it's actually mining or not....