Unafortunately I don't have specific timings to cryptonight, so I'm using the same I did to Ethash. For Cryptonight V7 the great surprise was RX570 4GB Elpida, getting 1000H/s at 1230/2030. It's quite impressive for me.
I may have to try this one. I'm running 1300/2000 on V7 and getting 952 h/s on my RX570 4GB Elpida. Have you tried Heavy on RX570 4gb Elpida?