MTMike,
I am running near the exact setup. I have finished the 52" front, moved hangers forward with 7.25 shackels. I have the 56 rear installed with a flip kit (from a member here long time ago, they bolt to the factory bracket) I had to install a longer drop bell-tech shackel and just DO NOT like the way it looks on the stands. I don't want to even get it on the ground.
I am running one less leaf then yours in the rear and my springs are near flat with the weight of the truck now. Are you running a cv rear driveshaft? This rig will never see the pavement but I think I will have to run a cv shaft. I am also 4" back on the rear and installed a 205 so my 203 shaft is way to short without flex.
Could you get me a measurement from the bottom of frame to center of spring hole on the rear shackel (lowest mounting point). Mine is at 13 3/8 right now and it is a bit much. I have a great angle just don't like the setup. I am running a 6 1/2 bell tech shackel to get the angle good. Ride height is near perfect with 1" rise to rear but I would think I could run the DIY and a zero rate to get a much nicer setup and get ride of the dang factory style shackel at the same time.