Curious when flying where is the ball? Most RV10s, mine included need some right rudder trim, this certainly affects the roll. Second, are you using a concrete floor to get those numbers or are you using a laser level system (the only way to go from my perspective). I find talking about fractions of an inch based on "level" concrete seems a bit iffy to me. My concrete nor professional jobs done for me are just not done at that kind of precision. I would also suggest some flap adjustments, bring the left one down just a couple of turn buckle turns. I personally have not had any luck with aileron rigging, nice to hear that can work as Bob mentioned. In some ways wish we had the RV7/RV8 trailing edge bend, was amazing what a change in that bend-radius did for correcting a heavy wing, not an option with the 10s. Maybe consider a small aileron tab, this has worked for others I have seen. Even with the rudder trim, ball in the middle, the left side tends to be just a little heavy, not really noticeable for pattern work and in the cruise, may I just say autopilot (yeah I know, sounds lazy, but is nice
). If it fits a flight plan, I try to have more fuel in the right tank too, usually burn out of there first.