Dang, just got back from aligning the K30 today and it looked really good. Some minor toe adjustment was needed but we were very, very close. The alignment guy said the rear alignment was better than a lot of new Chevy trucks he’s seen.
I did reinstall the camber shims because they were in the original donor truck and thought it drove great for what it was (hands off the wheel straight down the road deal). Tech did say it was really a preference thing and that it could create some tire wear, he also mentioned that they don’t mess with them.
Removing them would create a 0 degree chamber and it could feel like it was pulling to the right depending on the crown of the road.