If not happy with result take it back. Alos, It is up to them to decide what caster correction needed. Maybe if not happy find someone more competent.

Think only 2-3 deg caster correction bushes available for max 3" lift, or then use drop boxes eg for example:

https://www.superiorengineering.com....rch=drop%20box

With lift measurement may be able to help out. Mine 08 Wag with 2" but carries a bit of wt. Give me your measurement from under guard arch to wheel center x 4 or to the bottom of rim bead/lip and dia of rim at that lip point and I will do lift comparison for you as reference.