Man, I don't want to kill your excitement but you essentially have the same setup as me. 2 degrees maybe. Don't count on it. I just added 3 2000RPM pusher fans to mine and dropped a constant 1c under load. I then built a shroud for both sides out of cardboard as a test and dropped another 1c. The kicker is that with just the 3 medium speed pullers and the shroud (no pushers) it performed just as well as push/pull without the shroud (dropped 1 degree). So in terms of noise and efficiency, a shroud is a better deal than 3 more fans. Your results may vary, but give it a shot and see what you come up with.