Instead of using your radio to cut your throw down to 10%, it would be better to do it as much as possible through the mechanical linkage (go in on the servo arm and out on the control horn). If you use your radio - you're only using 10% of servo travel - that doesn't give you very good servo resolution at all. Its better for the servo to travel over as many gears as possible.

Better resolution gives you increased precision with your stick movements.