Here's another item that wouldn't hurt cooling, I'm ready to pull the trigger on one.
The other "trick" the Steilow use on Red Devil but not on Mayhem was this set up:
http://www.techafx.com/content/1969-...nt-spoiler-kit
I built my own, pics are buried somewhere in my thread.
Did you make those centers or have them machined?
Like the fan set-up