azcat, in this thread I can't tell if you are experiencing lee helm or weather helm, or just concerned about being "different" in regards to how long your .... rudders ... are. (haha)

Any, pls send email and I can send you tracing of my 5.7 rudders shape & pivot hole location.

One thing I did when I first got the boat is to change rudder angle to be more under the boat, it balanced the helm quite a bit. Basically i shimmed out the upper gudgeon with two washers, left lower gudgeon in same place. Much easier than modifying rudder blade itself. but, my rudder blade itself is the style with a cutout/projection, so it kind of project forward under the rudder casting about 1-2".

I also have a spare rudder blade (mystery brand) that I was experimenting with how to modify to make a higher aspect ratio blade. never finished

Jim