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.
Everything can be improved with bether code. Most of the developers have worked with the 750ti. But fast code on the 750ti isn't always fast on the other maxwell's.