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.