I'm still on the 10.6 version, which gives me over 196mhs on my 13 rx560 cards (using linux/hiveos).
From the 11.x version, I lost about 0.800 per card, which means that I lost a big 10mhs for my rig.
Using the 11.4 version, things got a little bit better, but still under 10.6 version. With this version I got 194mhs.
Not tested yet the 11.5 version, but probably the -oldkernels switch will bring me back the best performance I had with claymore.
that is right. But the stale share is less. So you might end more valid shares.
I have similar hashrate for v10.6 and v11.5, but you can try "-oldkernels 1" if you see bad speed. Also you can try "-asm 2" and "z" key to find best -dcri for ETH-only mode.