Yeah, I was sort of thinking the same thing. The centered position of the elevator may have a minimal effect on the aircraft performance during those types of maneuvers. Again, if it isn't a problem, then it isn't broke.. yeah, yeah.. I'm repeating myself. Sorry.

You may be spending a lot of time fixing something that is being caused by something unrelated. Check it out really well before you get into that much detail in a fix.

CGr.