Notice in the pic that the front of the rudder is extended forward past the casting about 2", so it extends under the hull.
also, notice where the pivot bolt hole is in relation to the casting. If you look closely, you may be able to make out a line that I drew on the rudder while in it's full down position. i traced the hole in the side of the rudder casting. Also notice that the rudder is pulled downward about 4" to get it to rock forward enough so that the rudder is plumb along the front edge. you can see through the rudder casting above the rudder head.
There is still a bungee attached to the top (popup)so I can't pull it backward easily. I just held it down and held the rudder forward far enough to get it plumb. If these are stock rudders, they may have intended for the rudder to extend under the hull to minimise stalling. Just a thought.
Look very closely at the shape of the rudder behind the level, you can see where it jutts forward.