The 6 HSTAB hinge points can be way off. I recently built up a new HSTAB for a project, and the hinges had to move substantially to align to the existing elevator.
the entire HSTAB and elevator kit is available from Vans. Then everything will be new, pre-punched, and will line up.
Big challenge is to match drill the HSTAB to the existing fuselage mount holes without creating a buggered mess.