I will also use some small air bags with my front leaf springs.
So I guess I will have air over leaf springs all the way around. However, I will be using them to help me cary more weight, and I won't be removing any leaves.
I personaly don't care much for lowering a truck. Although if I had to, and I do agree air bags are the best way, I would not do it by removing a few leaf springs. I would design and build or buy a tringulated four link suspension for the rear, and a link type suspensuon of some sort for the front. I don't think only one leaf spring will do a good enough job of locating your axles for anything more than show. It may work, but it seems to be a step backwards in many ways, safety included.