When my rudder was designed, I told the designer I didn't think it had enough balance. He said he was the trained professional, take his word for it and build it like he drew it. So I did. It doesn't have enough balance. So now I am rebuilding it like I wanted it to begin with.

Original drawing and my redesign in red:

Cut off most of the skin aft of the post, here is the 8" piece of trailing edge cut off:

Added 4" to the bottom (since 4" had also been added to the keel since the rudder was designed), reskinned with carbon, shown here getting sucked on:

I will know this spring if I made the right call I guess . Balance was about 12.7% the crude way that yacht designers measure. Now close to 17%. It steered fine, but with higher effort than it should for big corrections (I thought). Modern thinking is balance should be 16 or 17%.