I found that my trim tab is indeed twisted, which was causing most of the misalignment. I discovered this after removing the tab and setting it on a flat surface.
With the trim tab set aside for now, I clamped up the trailing edges of the elevators, and found I still had a difference of 3/16ths between the counterweight arm and the HS, when holding one elevator counterweight arm flush with the HS. from the research I’ve done, I’m going to leave this as-is, and move on. Provided the trailing edges are flush, it shouldn’t be a problem.