I have heard from other spaders that 1 oz. of torque per square inch of control surface. Would anyone say this is a good guideline for a trainer to a medium sport plane? how many oz. of torque to inches of control area do your planes have?

type of plane?
max speed of plane?
weight?
size?
control surfaces in inches squared with the output of the servo?
distance of control rod from servo center?
position of control horn and control rod on control surface?

i know im probably disecting this too much but being a mechanic i dwell too much on getting everything right. i just want to avoid any nasty accidents that i can.