My boat (Enzo with 400 hours) has started to vibrate in the steering column while pulling a surfer out of the hole. It does not matter if the rudder is turned or straight. It does not vibrate when there is no ballast in the boat but the engine does sound different than normal while surfing at 3000 rpm. We have not hit anything that in the water (that we felt anyway).
I greased the two rudder zerks and there was no change. If someone holds the steering wheel there is a little play on the rudder. Any issues there?
I looked at the prop and there was no visible damage.