The best situation when adjusting the mechanical linkage is to get the best movement with total servo throw, meaning that end to end movement for the desired movement of the surface.  This gives the best combination of control and resolution while maintaining total control of the servo movement and minimizing the battery current draw.</p>

It takes some time to get it right, but somwhere in the combination Ken displayed, and the effective use of end points (last thing to do because this effects resolution or precision if you wish).  </p>

You have to understand the throw constraints that the model manufacturer has listed, those being recommendations, usually based on experience with that plane, and should be approached from the least to the max, of course, starting at the least or smallest deflection.</p>

Get the thing ready to go and carefully adjust the throw to match the lowest throw listed by the manufacturer.  No dual rates for now, leave that for after you have maidened the plane and have "ironed out" any issues you have found.  Once you are comfortable with the flight performance, and want more radical movement, then go ahead and make the adustments, but be careful not to over extend the movement of the servo that will push it to the end points and beyond.. that is where you run into problems with excessive battery current draw and maybe a broken servo.</p>

CGr.</p>