Why are you aiming for your servos to move as little as that? You wont really notice servo speed when you're flying unless you've got 150% ATV on ail and you go from, say, full left then instantly full right. Even then, you would only notice with a medium/slow speed servo.

Go for max servo deflection and then alter your output arm and horn after that to get the desired movement. With the output closer to the centre of the servo you will get more torque. Same out at the surface (further away = more leverage).

Once you've done this you can then check you've got enough torque by flying full speed and doing a rates off roll. Then go to idle and if the roll rate speeds up as the airspeed comes down you've most likely got insufficient torque. You can do the same thing on rudder.

Basically you want to set your ATV as high as possible.

Hope this helps,
Angus