That's a huge hash rate difference, not sure why you would see that kind of variance between two miners.
Unless Diablo was giving you 4%+ invalid shares, it would be better to use Diablo over cgminer. You may want to check the cgminer thread or ask questions on the hardware forum about proper settings for your cards though, perhaps you can get cgminer to go as fast or faster.
THanks thats what I've been asking for ages, the experienced miners don't seem to have time for me! Haha
BAMT was able to fully utilize the GPU's it seemed, BAMT page says it uses phoenix, phoenix2 or CGMiner (or it said can manage them)
I posted the question on their thread
My
LAST question for you, if there are stale shares it would readout for example diablo right now says: "accept: 1466 | reject: 0 | hw error: 0"So stales would be rejects right? accepts ticks up about 1 a second