Ok, so better power supply. I can figure that one out. What can I do on cooling?
As far as miner/parameters the plan is to do whatever maximizes Mhash/s.
I moved with a couple of 120mm fans to help pull air across the cards, made a huge difference and things are running well. As said above the PS is your real issue, especially f you OC since you can get them pulling quite more then stock.