Increase the --gpu-memclock to 1750 or 1800, then increase --gpu-engine accordingly.
--gpu-engine accordingly.
??
Yes. Start at ~55% of the memory clock, for example --gpu-engine 950 and --gpu-memclock 1750.
Then on the cgminer window, press g, select and increase 10 Mhz on [e]ngine. Do this multiple times until the hashrate drops. Go back a bit and then use that value that gives you the best hashrate
Then do the same again, but using
-I 20 -g 1 --thread-concurrency 24000