[MFE III]

Patrick, I don't think it's a good idea to have your pusher fans wired into your thermo switch along with your puller fans. Since the 2 fans move air at different rates, I think you can create turbulence between the two - which is your radiator- and actually detract from the efficiency of the puller fan. I have my pusher fans on a manual switch and really only view them as decoration. Many don't even wire them in and just let them spin from flowing air.
Besides, taking your pusher fans off the thermo switch will cut down on the big draw you have when the thermo switch initially opens.
Just my dos centavos!
Matt