I'm currently mining on the dark side with a Sapphire HD 7950 using the same settings as with cgminer and scrypt:
"worksize" : "256",
"lookup-gap" : "2",
"thread-concurrency" : "24000",
"gpu-engine" : "1100",
"gpu-memclock" : "1500",
"gpu-powertune" : "20",
"gpu-vddc" : "1.094"
Another question, can anybody open http://drk.lotterymining.com/? After some tries I could reach the site and create an account. But now I can't reach it anymore. Tried Chrome, IE and Firefox now. Ping gets through.