did you tried this one?
https://bitcointalksearch.org/topic/m.28396744
i got 1800+ h/s on my monster testing server, 640h/s for 4cores of NVIDIA TESLA..
Yes, I tried that only, it's giving 38 h/s for this miner only. Do note that I have disabled CPU mining on this particular miner as it was also not giving best hashes for my CPU as well.
https://imgur.com/a/pzFIt
something is not OK with your config , i think... delete .txt files from xmr-stak (or better, backup them)... Then start the xmr-stak.exe and answer to all questions once to create again the config file
based on benchmarks, you could have 200+ h/s on your graphic card: http://monerobenchmarks.info/
Tried again by recreating config files, same issue. GPU hash rates not going over 38 h/s, no matter if I disable CPU mining or not via xmr-stak. What could be limiting it?