Agreed. PhoenixMiner is the best! I have 6x1070 rig. Etherminer gives me 185-188MH, Claymore 10.6 - up to 190.2, but requires 2 restarts of rig per day to have stable hashrate (using windows scheduler), 11.0 - 11.5 do not provide stable hashrate (170 - 190), 11.6 did not test and do not want, but PhoenixMiner 2.8c gives me stable 191.6!!!
I use CL uptime 20 days+++ flawless same hash no issues so speak for yourself. perhaps crap PC or crap gpu?

nvidia

? I run RX580's