Hi Christo I'd love to hear your thought since you probably have the most experience on those.
What else could it be, all is tight, SPC UCA are 6 months old.
No clunk at above 45MPH, clunk on low speed on change of pavement, small bumps of an inch or less, and cobblestones.
The first set was totally fine for the first 6 months, then the clunk started ( no changes on the truck or anything during that time), only difference being the set was installed over the summer.
New set of struts clunked since day two, I took them from the shop there was no clunck, but they had left the compression and rebound from the factory, I went home set them for my LC witch is stock (except your sliders and a set of drawers). Compression 1 rebound 6 for the front.
That morning Clunk fest ever since.
Speaking of, I'm thinking on sending you my LC for a full rehab and lot's of install, I am preparing the list shortly.