Something doesn't sound right about your speed with the 40 Yamaha. I am running the exact same boat and had a 40 Johnson on it and was turning 37mph with just me in the boat and could run 32 with me, another person, and fishing gear.
I don't know how it would run with the 50 Yamaha, but I just bolted on a 2005 50hp Mercury with trim and tilt and I am now running 42mph by myself and 37mph with another person. The Merc is a 2 stroke and I'm running a 10 1/2x15 prop on it. I haven't tried a bigger prop yet but I can tell you that a 11x15 is slower on the same boat.
Let me know if you go with the Merc and what prop size you decide on. Always looking to get a little faster if possible. Oh yeah, all the speeds were taken by gps readings.
Good luck
Living in Moncks Corner but looking forward to moving back to the West Coast in 2020 where there are more ducks and less duck hunters!! LOL
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