use sgminer 4.0.0
i13
lookup gap 2
tc 8192
powertune 20
engine clock at stock
mem clock at stock

1 find better tc your card start. (multiple of 2048)
2 find high mem your card work (1500 often is a good deal, but card can work over 1800)
3 find high engine your card work (start about 60% of mem value and add 5 per time, good deal are engine = 0.70*memclock)
4 set intensity.

sgminer, works better than cgminer, it is based on cgminer but fixed for only script minig.
only this, can improve your hashrate, after start you only have to find your best setting for best performance in hashrate or in hs/W (if power is not cheap).

if you can, post your batfile and results.