Ben,
I have one inch servo arms. My plane is not set up for 3d just precision. I set the servo for 100 percent travel, then adjusted the distance from the aileron until 100% servo travel gave me 100% of my desired maximum aileron movement. These planes have a lot of aileron authority.

PS: In my opinion you don't need the black plastic nut. I screwed in a 8/32 screw, from home depot and cut the head off 170 flights no problems.

Dan