That's a pretty sizable rig. It's safe to say I am mad jelly.
How are you finding the BE's coping with being so close together? Also, have you ever had your hash rate gradually decrease over a couple of days (and then have to restart your mining software)? This seems to happen to me about once a week.
I hope your window is North facing...

My window is south facing.... yea not ideal. Having the miners so close together doesn't seem like a problem, they don't get that hot. I run bfgminer and haven't run into the issue you describe. They seem to mine at a fairly constant rate.