There was a great article on Model Aircraft News this month about servos.

One of the things discussed was the amount of power and force the servos need when you adjust the linkages this way.

The bottom line is that you want the BEST mechanical advantage, which comes with having the linkages connected to the inner holes on the servo control horn arms, and the outer holes on the control surface control horns.

While this may diminish actual surface movement, it results in the best holding power with the least amount of drain on your system.

The inference is then to adjust the servo arm movement as high as possible to gain additional surface throws instead.