Rig: W8.1 x64 AMD 14.7
5 x Gigabyte R9 270's
Claymore 6.1

I barely get a boost at all on one rig and I'm doing a little better on the other.

I've been using this as my config:
setx GPU_MAX_ALLOC_PERCENT 100
NsGpuCNMiner.exe -o stratum+tcp://127.0.0.1:5555 -u 41t2Zk5SNBc... -p x -a 3 -wd 1 -li 1

Is there a better one for 270ss?  No x.
Thanks.