The next thing I would do is loosen up all the bolts and remove the center brace, then retorque and see what it looks like. . The center brace length being incorrect is the only thing that makes sense.. I have the same thing only made by M.O.R.E and mine look straight.
One m ore thing. Did you install the metal sleeves in all the bushings?
No sleeves in these bushing, the bolt shank is 1/2" dia, larger than the stock setup.
I have the same shackles and found the center sleeve to be a bit too wide for the brand of bushings I was using (Daystar maybe?). I don't know if there are differences between brands or what the original shackle design was measured for, but for the time being, I left the sleeve out and just installed the center bolt. Did the same thing as everyone has mentioned and jacked it up, loosen u-bolts, snug the bushings, retorque u-bolts. Seems a little better, but I have not put a lot of miles on it since then. I need to beat on the suspension a bit and see where it sits after that.
1986 CJ7, 4.2 w/4.0 head, TFI-HEI hybrid ignition, Clifford manifold w/Holley 390 w/cold air intake, OBA, 4.5" lift, Woody CV shaft and Tattons in front, 4.10 gears - lunchbox in front, Truetrac in the back, twin-sticked, blower upgrade for running topless, trying to keep it simple.
It's just a Jeep, and if you don't wheel it once in a while, it's not even that.