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I have the same boat and motor. F115 Yamaha which replaced the 115 2-stroke it came with. I am not unhappy with the power or speed but I would guess you have a reduced top end having switched from a 150 2-stroke.

My F115 is now almost 20 YO and still doing fine. If I re-powered I think I would go to 150 for the times a bunch of people are on the boat.