In version 31f the overall performance on my rig with 12 552rx fell to 200+ hashes (from one card 347-> 330) The settings were exactly the same, the trick I used, maybe this version does not work now.) 
I return to the royal 31e version of the miner
Developer, what drivers do you use for testing? I'm using 18.3.4.
PS: Just in case, I bring the parameters of the video card on which the rig is assembled.
Rx550 2gb Baffin 1150/1800 (1071/1500) 768sp/12cu (unlock 640/10), mem Elpida
On the test card 588 on the new version, on the contrary, growth is seen on the Heavy Algo from 1100 to 1120 hashes!
I return to the royal 31e version of the miner
Developer, what drivers do you use for testing? I'm using 18.3.4.
PS: Just in case, I bring the parameters of the video card on which the rig is assembled.
Rx550 2gb Baffin 1150/1800 (1071/1500) 768sp/12cu (unlock 640/10), mem Elpida
On the test card 588 on the new version, on the contrary, growth is seen on the Heavy Algo from 1100 to 1120 hashes!