ok heres the deal on a level kit ....My 95 did the same thing, I tried all the above the only thing that fixed it was to remove the level kit and install the stock set up, it never happened again.
2:you will prolly have to install a set of ball jiont eccentrics to get the correct caster and camber.
well my truck had a .4 and a .6 neg camber which i brought to 0 and my caster instead of tweeking the control arm ecceentric to get a .3 cross caster i wanted a caster of 3.2 and 3.5... i centered my control arm bolts and did the fine tuning with the ball jionts. I wanted the axle to sit square in the frame..The eccentrics are only needed to adjust camber and cross caster. None of which are effected by a leveling/lift kit
Though the caster (adjusted by the lover control arm eccentric bolts) should be re-set after a leveling kit. lifting the front end creates positive caster and potential death wobble, so have it set back to stock specs after doing a leveling kit!