I did all the work myself, I have no clunking since I put them on. There are a few things that need to be done during install that I hope all shops would do. One of them being the lower shock bolt. It has grooves on the bolt head side bushing that need to be seated and torqued AFTER the tires are back on and the truck is on the ground.
Another is the sway bar end links are pretty delicate on these things. The best way to get the lower control arm to properly come down is to take off the bolts on both sides of the sway bar bushing mounts and let the sway bar rest on the skid plate, leaving the end links alone. If they did take apart the end links they MUST be torqued under load, just like the lower control arm shock bolt.
If the springs are properly seated in the perch and the perch is lined up correctly, with the notch over the flat hex nut on the shock body, then I would be looking at sway bar end links and lower control arm bolts being tightened under load, on the ground. If they tightened these up on a lift, have them loosened (unseat the bushing on the lower control arm bolt head end with a pry bar) then re-tighten and torque on the ground.