Already did that. That made a minor difference.
The only thing that I can think of that may be hindering my braking performance is that my rear pads are wearing out faster than my fronts, which makes me think the rears are doing more of the braking than the front. That is opposite of what I would think should happen. Seems like the fronts should be doing more of the work.
I talked to my brake guy yesterday, and he said that the proportioning valve on a lot of trucks are set that way because a lot of rotors used to get cracked when their was more brake pressure going to the front.