Look guys, rather than specifying the clock, voltage, etc. just let the damn mining software manage it by setting auto-everything and specifying target temperature range. Trust me, the mining software knows what to do a lot better than you do.
Not sure about your rigs.. but if I enter just a url & u:p to cgminer, it "auto-everything" gets ~15kh .
Did you forget to tell cgminer to use scrypt? That could be an issue.
Here's an auto config file - save it as filename.conf, substitute contents with your pool name, username, password, then run "cgminer -o filename.conf.
{
"pools" : [
{
"url" : "YOUR_POOL_URL",
"user" : "YOUR_USER_NAME",
"pass" : "YOUR_PASS"
}
],
"temp-cutoff" : "85",
"temp-overheat" : "82",
"temp-target" : "80",
"temp-hysteresis" : "2",
"auto-fan" : true,
"auto-gpu" : true,
"api-listen" : false,
"expiry" : "120",
"failover-only" : true,
"log" : "5",
"quiet" : false,
"retry-pause" : "5",
"scan-time" : "45",
"intensity" : "9",
"gpu-fan" : "0-90",
"gpu-powertune" : "0",
"vectors" : "1",
"worksize" : "256",
"gpu-threads" : "2",
"kernel" : "poclbm",
"scrypt" : "true"
}