When you hear the noise, is the cutless bearing dry or wet. If dry, the bearing needs water to lubricate it. If wet, then did you do a strut/shaft/engine alignment? 

Charlie,

I totally agree with Paul.

You shouldn't be hearing anything. I'd suggest calling that "really good guy" and find out how he checked the alignment. 

You had better check the alignment. Bad alignment will SNUB virbration and NOT cause it. 

There are many out there that are under the impression that bad alignment causes vibration. When I hear this, I often use the analogy of a tuning fork. When you press your finger on the side of a vibrating tuning fork which is a misalignment, the vibration stops. The typical causes of vibration are a bent out of balance prop, a bent prop shaft and then a worn cutlass allowing radial play of the prop shaft.