Did you try gpu-thread: 2 and xintensity with your hw-configuration
and one of the experimental kernels in sgminer ?
You can reach over 90% of your hashrate for WU:
I have got
1.18MH/s and 1100WU
1.40MH/s and 1297WU
I noticed there's a /kernel folder with a couple files in there (alexkarnew.cl alexkarold.cl ckolivas.cl psw.cl zuikkis.cl) but to be honest I wouldn't know how to tell sgminer to use one of them.
My config is:
"intensity" : "20",
"vectors" : "1",
"worksize" : "512",
"kernel" : "scrypt",
"gpu-dyninterval" : "7",
"queue" : "1",
"retry-pause" : "5",
"scan-time" : "30",
"shaders" : "2816",
"thread-concurrency" : "24550",
"gpu-powertune" : "18",
"gpu-thread" : "1",
"sharethreads" : "32",
"lookup-gap" : "2",
"gpu-vddc" : "1.000",
"gpu-engine" : "950",
"gpu-memclock" : "1500"
I'm pretty happy the graphs on Clevermining are now a lot more realistic, I guess patience isn't my strongest point
http://dump.chiko.nl/g/a82334.png