wire
I have some friends on the chesapeake here that ran a wire from the back corner of the fin keel to the front corner of the rudder on their Pearson. This wont work for all boats, but I'm thinking about it for my h34 -- the idea is that the wire does a pretty good job of keeping pots from the prop and from the rudder post while allowing free movement of the rudder. might be worth a look. m