on second thought, looking at this photo:



your rudders appear to be raked too far forward. Are you sure you have weather helm or lee helm? If you have weather helm, when you let go of the tiller, the boat will want to turn to head to wind. With lee helm, the boat will want to turn away from the wind into a reach (and further). The way that looks, with them raked so far forward, you probably have pretty severe lee helm. The way we traditionally measure rudder rake is to use your level like you have shown, but hold it flush with the transom of the boat. Draw a line on the rudder straight down from the transom and measure the distance from the leading edge of the rudder to the line.

If you look in the bottom of your lower aluminum casting, there should be a threaded hole with a large plastic screw in it. This is to limit how far the rudder goes down when it's all the way down. I bet you don't have the screws in there.

The head shape on that rudder does look odd though - it's as if someone cut out the head so the rudder would rake further forward.