I have already a F159 and yes it's blisteringly fast in 10-12 knots compared to anything else on the water.
So why the Phantom race at all? If it's fast in 5 knots non planing wouldn't it be beaten by the Serenity anyway? Doesn't it have cruising potential in mixed 5-12 knots conditions (non planing/planing) if you want to go really far around an island or up the coast or??