This site may be useful:

http://www.fayettevillercclub.com/id26.html

I like to use about 70 percent of top speed when calculation required servo torque.  High aileron and elevator travel is very useful when fighting wind gust during landing approaches, but the same travel may produce excessive roll and pitch rates at top speed.  Undersizing a servo results in momentary servo stall at less than full control surface deflection, which may prevent wing breakage upon panic application of full elevator in attempted recovery from a steep dive.