Cannot get full front suspension rebound.

The suspension definitely needs to reach full droop, so you'll have to investigate what is binding up. I don't see a problem with your combination of parts, but something isn't right.

Are your torsion bars in place? I see that the shocks aren't installed, so that's good for now. Have you already torqued the UCA camber bolts and LCA pivot nut? If any of that stuff is torqued, loosen it and see if that fixes it. If not-

If the torsion bars are in place, make sure the torsion bar adjusting bolts are all the way out so there's no chance the suspension isn't just sitting on the adjusters. Otherwise it's just the torsion bar tension holding up the suspension.

The next thing I would do is remove the strut rods, and see if the suspension binds without those. If that fixes it, you need to readjust the length of your strut rods.

If that doesn't fix it, you need to look at the control arm pivots and bushings. I would separate the spindles at that point so I could evaluate the UCA's and LCA's separately.