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I'll also say the F70 is an incredible motor. Super reliable, starts instantly, very quiet, sips fuel - you can run all day hard on 5 gallons or less. But that's a whole lotta motor for a 15 - It would scream. If you don't want that, a throttle reducer is a good suggestion.
I am told by my master yamaha mechanic, that outboard hp used to be measured at the powerhead vs now it is measured at the prop. Thus older hulls are getting more hp at the prop when you are running the max outboard hp rating with a new motor. I am not sure the real difference and end result, but it is an interesting fact. It would be cool if yamaha had a new & light 100hp outboard - Because I would like to see how it would push a 17 hull!