So long as you're not reducing the throw via ATV's you doing it right. If you're running your ATV's reduced you're giving up servo resolution. Set your ATV's to maximum (I actually set it just short of maximum to account for centering adjustments.. about 140%), and then adjust throw mechanically to get what you want. THAT'S maximum resolution and mechanical advantage.
There's a nice linkage design/analysis thing for Microsoft Excel that will tell you how much force will be exerted on your servo. It's located at:
http://members.cox.net/evdesign/page...ge_design.html
It's worth the money for sure and I find it to be invaluable in determining if I'm using correct servos for an airplane.
Great information and link Doug. Would you please explain a little more about why the 140% to allow for centering adjustments. I guess I don't understand the centering adjustments enough to make sence of what you are saying. How does subtrim affect ATV? I have been setting up the ATV's to 150% and then reducing the ATV on the surface that is traveling more than its conterpart to have equal travel for both surfaces.