If your gonna tune it.. it right.. pull those air bags and start at zero.. you
have air bags.. you are doing the same thing with a few different
items.. shocks are control the wind up or slow the rear end down..
if you want to do it right you need some weights first then you can
look at the rest.. but from what I've read you wont want to do it
EDIT
you need a loose front end so you get the front lifting but a lot
of work in the rear