Consensus seems to point toward an OEM 11" then. That's what I'll do and I'll let you know what happens. As Chipco Says at least we have limiters on these engines so should it over rev on the occasional one up trip it wont destroy itself. Don't forget though that the ECU on these engines records the number of times the limiter is deployed as well as % of time at various throttle openings. The dealer may frown come service time
Chipko, you're correct my boat has a 20HP limit but the newer TS370 has a redesigned transom allowing it to take a 30. Ribeye documentation is conflicting regarding this but I called them for clarification some months ago. As I need my engine to be portable, the 20 with the electric start is heavy enough and to be fair, fast enough for what I want it for. Listen to me all grown up.
Vibration - yes at lower rpm it's there but not that bad. My Honda Fireblade motorcycle used to give me vibration white finger on the throttle hand. This is nowhere near as severe and is unnoticeable at higher revs.
Can I digress a little. My engine has about 18 hrs on it and is 13 monthis old. The dealer who gave me poor advise at point of sale has quoted me £69 +Vat for an 11" prop and has offered to fit it "Free of charge" if I take it there for it's annual service. he's quoted me £186 +Vat and in a bid to justify it explained it includes plugs and new impeller. Neither of these are listed on the service schedule. OK it lists a valve clearance check (which I doubt he would actually do) but it seems a lot of money for engine oil and filer and lower leg oil change.
Normally I would service it myself but until I gain confidence in it I think a dealer stamp is a necessary evil. This "Main Stealer" price seems a bit excessive though. Anyone got any service bills to compare?