Miles, you also have to realize, with a plane with a thrust to weight ratio, and a speed envelope, such as with this Edge, you will not have pefect tracking at all speeds and attitudes, you have to fly the rudder as well as all the other control surfaces. If you designed a plane for zero airspeed, i.e. hovering, waterfalls, and other "stationary 3D maneuvers" you would need max right thrust. Conversely, if you have a plane designed to go 200 mph all the time, you would need minimum right thrust. The Edge spends time in the air with a speed envelope from a little negative to plus around 60 mph probably, so you have to find a sweet medium for your right thrust, and use the rudder for the rest.
DKjens