I see you are using an adjustable upper control arm. The stock control arm is fictional but seems to lack much adjustment. A cross shaft like the original first Gen and second Camaro's would be better.
The 1988-1995 GM trucks use two bolts and eccentric and as soon and you make an adjustment they no longer travel on a common pivot point and it actually binds the upper control arm, poly bushings make the problem worse. And to add to that GM used the same design later with adjustment on its 4x4 trucks on the lower control arms.


I will take some of those welded up spindles. Look at this welds!! I need to practice my TIG welds!!!