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In general, I would stay away from generic prop dealers/shops, as most don't know what they are talking about and generally sell aftermarket brand props such as Michigan Wheel, an average brand. I think this guy is giving you bad information and pushing the line he sells.

I would stay with Mercury manufactured props for that engine, and they are the world leader in outboard props anyway. They know their prop technology, and have generally invented most of the prop technology used today (such as venting and interchangeable hubs) and copied by others, and make the best.

The Vengeance is a good SS prop, but i hear it is fairly aggrressive in pitch, and generally underrated in pitch a little. Yours may be running like a 15" pitch.

For your situation you should be looking at the 4 bladed aluminum Spitfire, a brand new technology. See here:

https://www.mercurymarine.com/en/us/p.../spitfire/

Mercury also makes the same prop in their Quicksilver line, called a Nemesis, for a few dollars less and available on line. You can get these without having to buy another hub kit. You would want the 13" pitch from what I can tell, but be careful of overeving with a light load.

For absolute best performance, and if you have the Bigfoot/Command Thrust gearcase, you can get the Spitfire in SS, called Spitfire X7. But it's about 3 times the cost, and for a boat that only runs in the 30's, generally SS is not needed. Mercury's aluminum props perform surprisingly well.

The best on-line pricing I have found for Mercury's high end SS props is here. They also sell the Mercury aluminum line. I have bought several props from these folks.

http://jacosmarine.com/new-mercury-pr...ropellers/