So you have had your Stealth for over 4 years and you have never pitchpoled? Your description of it diving in and then "pop" back up reminds me a lot of my early sails on a Tornado.

How long ago did you put the T-foil rudders on? Are they class legal in the Formula 16 class? Do they think they really do the job as far as preventing nose-diving?

Maybe it is not a problem in your area, but in some of the areas where we sail there is a lot of grass floating on the water that gets caught on the rudders. It seems like that would be even a bigger problem with the T-foils. Have you ever encountered that problem? If so, is it harder to get the grass off than with regular, plain-old straight rudders? I assume it would be.