Yea, I was trying to clarify that when I went back and looked my elevator halves ( movable parts ) were not matched and part of my need for what I thought was a suspect amount of right Aileron trim was a result of the elevators not being matched. But as to your post yes I agree if you want to have a very straight flying plane through all attitudes than you must insure that all incidence angles are correct. This is definitely a must for anyone flying any type of precision competition or even 3d for that matter. That said, it's probably something the sport pilot doesn't really need to worry about unless the manufacturer has really screwed the pooch during the building process. This being my first large scale plane I am really happy with it, it is perfect?, probably not but I can't tell and I am happy with the way it flies and I think that is what matters . Heck, Ill probably do something dumb like run over it with my wheelchair before I get 25% of the planes serviceable life out of it lol

So basically check all the surfaces, here is a small list of surface and linkage related items to look at that may help you to remove a bit of trim that might have been used to compensate for a problem somewhere else.

Do they line up with each other at nutral?.
Do they work in unison through their range of travel.
Do they have the same range of travel?
Is your linkage geometry the same on both sides?
Are your servos' working at the same speed and centering correctly?
Do the control surfaces move freely without binding or applying pressure.

Minus any aileron differential added if you set up your plane this way I would imagine that is the best you can do other than playing with thrust angles and incidence. I may have missed some things but these are the things I looked at when I was trying to figure out why I had so much aileron trim.