I cruise my FS4372 out here on the left coast of Canada. When the boat really gets moving on a beam reach with a stiff wind, there is a vibration set up that resonates quite a hum through the whole hull. It feels like it could be coming from the rudder but since it resonates in the whole hull it could also be the centre board. it disappears as soon as speed drops to 'normal' cruising levels. Anyone experienced the same? Ideas on cause and gow to fix would be greatly appreciated.