They say that pinion angle is more important than caster, but at 4.5" with the pinion turned up that much, you probably don't have much caster at all. How do the coils look from the side, are they bowed/arced too much? Pointing the pinion parrallel with the DS is okay when you have a double carden at the other end. What size tires are you running? I'd be surprised to find that you're able to run 33's or larger without death wobble in your current setup.
All STOCK Rubicon Unlimited