Good day. Want to share my results.
Performance of my hardware with 10.2 (tweaked hashes and -dmem 1):

   R9 290x (1122/1376)  928 H/s  ( -h 968 )
   R9 290 (1124/1376) 931 H/s ( -h 960 )
   RX 580 nitro+ 1340/2000 1020 H/s ( -h 1896 )

And 11.0 (auto hashes and -dmem 1)

   R9 290x (1122/1376) - 910 H/s
   R9 290 (1124/1376) - 893 H/s
   RX 580 nitro+ (1340/2000) - 1036 H/s

By changing hash parameter for GPUs I managed to up 290x hashrate almost to old value, but 290 won't go more than 893. So for me old version is better.