Have a question/Need advice on rear Shackle Flip

Hey guys, I am trying to plan out what I want to do with the rear of my truck, as I am going to be due for new rear shocks soon. I currently have All Pro Expedition leafs with OME N182 shocks, I plan on keeping the leaf pack, and upgrading the shocks.

I wanted to know if there is anything to be gained by doing a shackle flip in the rear with the Expo leafs. Since I typically run with my bed pretty much empty, I am already at 3-3.5" of lift, I don't really want to raise it up any more than it already is. I know that will limit the length of the shackle I can put on there, with the shorter shackle, I wasn't sure if that will also lessen the droop gained enough that it wouldn't even be worth it to do the flip.

Thanks!