Dead Low tide at Bucks. Last run was 30 minutes before low with 29 cm Hotrod, then realised f****n shallow. Ooops!! Changed to 23 cm HR for clearance and went back out. But wind had dropped, very patchy and swung more West. 23 cm very slippery and quick, but not much drive getting back upwind with incoming tide but worked okay in the flat. Best run with 29 but managed a 32 knot with smaller fin.