Good progress, especially for the wait.
I don't know if you can go 3" more in the rear. You would probably have to shave your snubber and even then, your pumpkin would probably hit the bed floor. I agree with N2Trux, I wouldn't go with a 3" block either. Maybe try a 1" block and see what that buys you. Pulling leafs probably wouldn't help much since you've got a flip kit. Maybe it's time for a link bar setup and some rear frame/bedfloor mods.
Keep up the good progress. It's getting there.