Regarding the Tybee specifically, I think developement would benefit by an "Open Class" with few if any rules regarding design. Because you are launching through surf, the transom hung rudder needs to go away, or fit a couple of robust sweeps so the crew could power out throught the surf (think of the Australian life guard competition where they row a dory through very heavy surf).
One thing to be aware of is , what you start with you sail with. There is no time to switch things around. As tight as the racing is, every second you lose you will NOT get back.