Edited for clarity : Point the pinion directly at the transfer case ...
My 01 XJ had terrible front shaft vibs, especially after regearing to 4.56s.
After trying several wrong things, I aimed the D30's yoke directly at the driveshaft so the angle was less than a half a degree...vibs gone completely.
The FSM says pinion angle (less than 1 degree) supersedes caster specs.
Follow CJ7-Tim's suggestion and see how it feels
2001 Sport, 4" lift, 33 X 10.50 KOs, R.E. DB, R.E.-UCA, JKS-LCA, ACOS, 8.25-4.56-TruTrac, SYE, D-30 E-locker w/alloy shafts, Hidden M8000 winch, Vanco front and ZJ rear disc brakes, Lots of armor, Towing baseplate.
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