The eccentric hinge line creates the mechanical equivalent of a lever.  You do not characterize the amount of force required to move the rudder, but the force on the hinge can be many times greater than the force applied to the trailing edge. Over a long period of time the cyclical forces could result in a crack and a broken hinge. 

I would start by running a thread under tension through the center line of the bushings to see how far off they are.  If it is small you might be able to adjust it with an eccentric bushing, but most likely you will have to relocate both sides of one of the hinges. Pick the one that results in the best fit.

From: Bryan Wullner <vonjet@gmail.com>
Subject: [LML] Rudder concern on 360
To: lml@lancaironline.net
Date: Monday, June 9, 2008, 6:10 AM

Would like opinions from the 320/360 owners.

My rudder hinge installation didn't go as good as I would have liked it.   I don't know exactly what happened but what I believe is that the 1/4" steel rod that is used as a jig, per plans, to align everything was not perfectly straight. 
Now, when my rudder is installed and swung back and forth.  There is a sweet spot in the rotation.  If I take the rudder and go full deflection one way or the other and release it..........it swings back to center.  This would seem to prove the sweet spot is when the rudder is centered and that is because this is where it was while the hinges were curing.  So the rudder likes to be resting in the centered position if no forces are on it.  It still swings freely no binding or anything its just it does like to go back to center after released. Part of this could be because of the counterweight too but I definitely think there is a sweet spot in the hinges.

Would like opinions on if this is going to be an issue that should be corrected or something that I shouldn't be concerned about.

Bryan