[johnsjmc]

Remember it appears the car used to track straight before the rebuild of the front end. Unless you have bent something (crashed) the caster angles were probably a little low before and the car still tracked straight. It,s likely toe related and easy to fix.
The tar mentioned is sealer on the upper strut mounting bolts. I expect your son would have seen that and removed it if needed to move the struts. Euro height isn,t low enough to reduce caster significantly below spec.