A big part of the problem in the Worrell is not just the lack of support for the blade. You can support it all day long, but if your boat is pushed backwards by the surf and your rudders dig into the sand.....well... something is going to break. Yes, the castings got split and rudders broke, but support throughout the rang of the blade (up-down) is not going to save you every time. I think I would rather see a casting or blade break before the gudgeons got ripped off. The construction of the blade also makes a big difference. Stock I-20 rudders don't have the strongest heads.

p.s. Dotans look really cool. I don't have any experience with them, but I understand Lamorak was doing well with them in the Tybee 5.