The GPU commands make no difference, for some reason it'll just only run at 97% on both cores while at 13 intensity.
For me, on scrypt, only Intensity of 13 works. Two threads always runs poorly or crashes. Thread intensity doesn't make much difference. Core: 1049, Mem: 1500 are the best OC settings I could get, it's around 1080-1088 kh/s at these clocks.
However, I've discovered that SHA-3 Keccak runs great! Hardware errors around 12-13, but it doesn't drop hashrate much to lower it. Intensity around 9-10 gives around 700-710 mh/s, Core: 1200, Mem: 1100
Now if only more coins were based on Keccak.
(only ones I know are Helixcoin, Maxcoin, and Copperlark)