If I were you I would find a way to bring the caster back into spec--either the cut and shut radius arms, or have your swivels re-indexed, or both. The true trac really only helps with return to center, and will make it wander a little less. It won't fix the diving that your truck will now do in panic stop situations.
Regardless, your truck will never drive like stock again. You'll get used to it.
Edit: Avoid the offset radius arm bushings. Those have a rep for wearing out very quickly if you wheel the truck.