This is where we ended up.  The only thing different right now is the way the 3 cards in the front rig are mounted and the fan us hanging up above the rigs blowing down on an angle for better air flow.  Almost every card, except one, is mining at or below 50 deg C with some pretty significant overclocking going on.  (Up to 1718 on memory)  The one card that isn't running so cool is getting taken apart in the next few days to get a good once over.  Give it a re-paste, make sure all the screws are tight on the cooler, etc.  Its only about 5 deg warmer then the others, but its enough for me to want to investigate.  I'll post up an updated picture come Tuesday when I get back to the rigs to play with them some more.