getting 200khash from my r9 270
That's not too bad, remember you're mining a coin with increased n-factor. I've got 250 with 7970.
I got around 300 Khash with each 7950
exeminer.exe --nscrypt -o
http://127.0.0.1:9031 -u xxx -p xxx -w 256 -g 2 -I 13 --lookup-gap 2 --gpu-engine 1100 --gpu-powertune -20 --gpu-memclock 1500 --thread-concurrency 11000