The reason I asked what springs you are running is because I am concerned that if you move the front spring hanger another inch forward you will have a poor shackle angle. You are somewhat limited as to where you can mount the shackle because of the body mount.

Some people have solved this problem by mounting the shackles below the frame instead of through it, such as David "DRM" Moore who posted above. If this is the way you want to go check out his website, which is posted in his signature. Note that most people running shackles under the frame use relatively flat springs as opposed to something like the All-Pro lift springs.