Wouter:
There are 1000 and 1 reasons why the rudders break - negligence, skipper errors, improper "center of the lateral plane", defects in workmanship, weakness of the materials etc. If the problem is on our side, we would like to address this problem and solve it. Consequently.. in order to find out where the problem is, we have to get feedback from every sailor with such experience and analyze all the facts.



Mary:
You are right, as you can see in the photo, the rudder is tilted off-centre. However, there is not a problem with this and the gudgeons are aligned properly. This setup(when gudgeons are not centered) gives a small, positive effect when taking into consideration sailing at heel.
In this case it is very important to preserve rudder parallelism.

Without any doubt, the rudder blade is not twisted. It looks like an optical distortion or something like this.