The vibration may just be the trailing edges of the rudders need to be tuned up. I have a 97 and love it! The boat is tough. Mine used almost every weekend from March to December.

I haven't had a problem with my mast. The only thing about the mast and beams for that matter is the powder coating peeling off.

The previous owner put Nacra castings on the boat and they work great.

It's a great all around boat.

Not enough rocker? you guys must be thinking of a different boat.