longer shackles should clear that up and possibly move your mount a half inch back or so

It also looks as if you increased your wheelbase an inch or two. The rear axle is a little further back from center. Not a problem, unless you get tire rub under compression, you'll need to cut some sheetmetal. Moving the front hangers an inch forward will also fix the shackle thing. But for ease, longer shackles will do 'ya too.

Ditto. When you stuff the rear say good-bye to your lower bed. The springs must be moved forward.
Looks scary tall too, avoid off-camber.

looking at your pictures, how high your truck sits right now.
I would be (and am thinking about it as I just bought the 3 inch springs for my wifes truck) moving the upper shackle mount up into the frame. Longer shackle and no added lift.
weld in some tube the correct size for the bushings.
maybe cut the thin inside part of the frame and replace with 3/16 and plate the out side also. moving the in side part in far enough to be the same width as the shack mount.
or just plate both wides and make an off set shackle simular to the front one. wide at top and standard at the bottom.

Any one see anything at all wrong with this idea?

heck I may do this to my truck also. longer shackles would help me with droop.

Pinion angle is all...
Low is good for sure.