A couple of topics previous to this one on the "IMAC" forum I found some good info located at the Aircraft Proving Grounds website:

http://www.geistware.com/rcmodeling/...tics/setup.htm

I am sure there are more articles out there, but this should get you started in fine tuning. Specifically reguarding multi-point mixing. Checkout set-up #2 as well.

Wheels up!