Here is my procedure. I set my endpoints to something greater than I will need after setting the subtrims. The sub trims match the servos/linkages at neutral and now you want to match them at the max throw. So I would set something up in the 135 range to give me more than some specific throw I do need, like 25 degrees of control surface up and down for elevators or right and left for ailerons. So use endpoints for matching servo/linkages. Then use AFR/Dual Rates to set the throws you want for each flight condition or mode. Never touch the end points after the servos are matched.

I'm not sure I should start this here, but you cannot change the resolution of the servo itself, unless it is programmable. It's output arm moves so many degrees per microsecond change in the input pulse width. That defines its resolution. Now with the linkage we can get finer resolution in terms of control surface degrees per microsecond change in pulse width by mechanical advantage. If the servo arm is half the length of the control horn on the surface we double the resolution of the servo/linkage system. There is a limit to how far you can go of course because in addition to resolution you need a large throw for spins and snaps etc.

So why is it better to use high values for ATV and AFR/dual rates? Stay tuned.

Jim O