main things I'd suggest:
1. extend the bumpstops properly, from the spring pad up. Leave the cup in the stock location, and make sure to use a stock jounce bumper.
2. correctly set your caster by lengthening the lower control arms.
3. push the axle top full bump to make sure the bumpstops line up during the suspension cycle.
4. check the mounts for damage/bending
5. after all the above has been done, the last resort is to bend the bumpstop tower by hitting it with a BFH + block of wood.
6. stay away from "off-road shops"...a good one is really hard to find, and you may know more than them...some are notorious for bad advice and only trying to sell parts & labor. you're better off doing the research yourself and putting your money into tools.