I had that discussion before - I have an original rudder and have NO problems with weather helm AT ALL, as long as the keel is in proper position (locking holes lined up), and the boat heels 10-30 degrees. I found no need to spend $400 for a new rudder at all. But, that's just my opinion.
yep, the Rudder needs to be straight and locked. never had any problems with a partial daggerboard down.