You make mention of not getting the hole in the rear correct affects the stick position. The arm has stops and riv nuts ( I can't find what goes in them yet ) which I guess had a bolt and lock nut. You then set the alerons at a said value ( I did find that in the book ) with the bolts on the stopping plates. I would suggest there must be enough adjustment to center the stick and still get your set values. Like setting the toe in on your car and still having you steering wheel centred.
I am jumping ahead here as not at this stage
Lyndon