"It's the filling tide that is really annoying." Yup! There must be limits to the hull shape that can stand careening. I am guessing the I-28 is well outside them. I wonder what they are? I have wondered if, in an emergency, I could careen on top of my Avon and with its added buoyancy, keep ahead of the incoming water as I lifted on the tide. Bob Perry might have an opinion. It is his creation.
I can repair the fiberglass.
Now THAT is a GOOD idea