The 622WA is not the sedan.
I have the sedan and it's a nice hull for most conditions. If the hull can't take it, you probably shouldn't be out.
The only hull issue I've had is porpoising with the 200 on a pod. Most 622WAs that I've seen have the 200 in a motor well so you should be fine.
As to the Yammie corrosion issue, I was very worried about this. My Yamaha mechanic told me that mine (2005 with 500hrs) was 100% fine.
My rig is trailered and the motor is rinsed after sw use.
According to him, the horror stories come from long term mooring and are exacerbated by mooring in electrically 'hot' marinas.
Thus the reason most of the horror stories originate in Fl.
My understanding is the 200-250 use the same 3.3L block with varying levels of intake/exhaust tweaks being the sources of the hp changes.
My only MAJOR beef with my sedan is that water is getting in somewhere. It shows up under the step into the cabin. Campion's reply is basically, what problem? Aargh.