I'm using an ASUS 270x and tried --xintensity 1024 and 4096 and -w 64 and 256, but neither option helped me to get over 123 MH/s which I got with the original .cl also.
Could you maybe upload your bin file?
I Have installed 14.11.2 Beta driver and in sgminer directory opencl ddls from 15.3 driver