You may want to look into the Byerly Blunt. It is basically a stiff board, but it does have some flext to it. Especially on the tip and tail. I have been riding it behind the boat and love it.
Hopefully someone local has on for a demo - sounds like it could be a winner.
FWIW my favorite board of all time, bar none, an old DNA core Hyperlite Byerly.... It was green and had a witch being burned on it..... best board ever made.