Make a new empty text file in notepad named cgminer.conf, make sure it saves as .conf and not .txt, and save it in the same directory as your cgminer.
Copy/Paste the below into the file and save and then relaunch cgminer. You will not need to use your launch string, just launch cgminer on its own, it will read the values in from the new config file. Also be sure to delete any old .bin files that may be in the directory.
{
"pools" : [
{
"url" : "stratum+tcp://us.litecoinpool.org:3333",
"user" : "Miner.Username",
"pass" : "Password"
}
]
,
"intensity" : "13,13",
"vectors" : "1,1",
"worksize" : "256,256",
"kernel" : "scrypt,scrypt",
"lookup-gap" : "2,2",
"thread-concurrency" : "8192,8192",
"shaders" : "0,0",
"gpu-engine" : "1025,1025",
"gpu-fan" : "0-85,0-85",
"gpu-memclock" : "1250,1250",
"gpu-memdiff" : "0,0",
"gpu-powertune" : "0,0",
"gpu-vddc" : "0.000,0.000",
"temp-cutoff" : "95,95",
"temp-overheat" : "85,85",
"temp-target" : "75,75",
"api-mcast-port" : "4028",
"api-port" : "4028",
"expiry" : "120",
"failover-only" : true,
"gpu-dyninterval" : "7",
"gpu-platform" : "0",
"gpu-threads" : "2",
"hotplug" : "5",
"log" : "5",
"no-pool-disable" : true,
"queue" : "1",
"scan-time" : "30",
"scrypt" : true,
"temp-hysteresis" : "3",
"shares" : "0",
"kernel-path" : "/usr/local/bin"
}
Change the pool information to the pool you are using of course. Also the gpu-engine and gpu-memclock lines are for setting your gpu speeds, I place lower values in this config that should get you into 700 kHash easy, you can experiment changing these on your own in cgminer once everything is up and running properly.
I did this, and I am getting 508.8kh/s with these settings combined, 241/283 per card.
I have briefly gotten up to 1.3 MH/s but then it was crashing with these settings;
"scrypt" : true, "intensity" : "13,13", "gpu-engine" : "1020,1050", "gpu-fan" : "0-85,0-85", "gpu-memclock" : "1500,1500", "gpu-powertune" : "10,10", "temp-cutoff" : "95,95", "temp-overheat" : "85,85", "temp-target" : "75,75", "thread-concurrency" : "11200,11200", "auto-fan" : true, "auto-gpu" : true, "expiry" : "120", "failover-only" : true, "lookup-gap" : "2,2", "gpu-threads" : "2", "log" : "5", "queue" : "1", "scan-time" : "60", "temp-hysteresis" : "3",
"kernel-path" : "/usr/local/bin" }