I got frustrated and reinstalled windows. with cat 12.8 and app 2.5 installed, total right now is 944Kh/s. System ram is 8Gig. I feel like adding the forth card did nothing to output. As if the output of the other cards has been shifted to the fourth card minus some output.
Unfortunately unless other miner clients mature, I will be using guiminer because of it's simplicity.
You should definitely try cgminer.
Go along the analytical readme and most likely you will be able to squeeze out more Kh/s from your cards