My poor superclocked 950 can barely get 5400 KH while my overclocked 750 TI can get north of 5200 KH using much less power- is there any more data I can give you to help with dialing in the 950? Intensity for both seems to top out at 20.
There is nothing wrong with your 950 or your config. All 9-series maxwell gpus are poor in lyra2v2 performance compared to 7-series maxwell hash/w wise. 950/60 really suck because of their crippled 128-bit memory lane. Better mine some other algo with them.