I have the following 2 cards

1.ASUS 280x 245 Kh/s
2.XFX 270x 165 Kh/s

with the following config

setx GPU_USE_SYNC_OBJECTS 1
setx GPU_MAX_ALLOC_PERCENT 100

del *.bin
vertminer.exe -o stratum+tcp://east1.us.stratum.dedicatedpool.com:3361 -u xxx.xxx -p x -I 12,12 -w 256 --thread-concurrency 4196 -g 2 --gpu-memclock 1600,1500 --gpu-engine 1100,1050 --gpu-powertune 20 --temp-target 70,70 --auto-fan --gpu-fan 30-100


what am I doing wrong? or what can i improve