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Tim I agree the Power Tech service is great and they gave me some recommendations including not to change, but from a fluid dynamics/mechanical standpoint based on RPM's, blade area, possible slip, and power. Theory will tell me one thing and only trial will tell.
A 15 foot Glastrom speed boat reacts different than a 15 foot Boston Whaler CC with the same power source. To the prop manufacturer they are both 15 hull of a certain weight with exact same motor resulting in the same prop recommendation.
Like I said before I'll know this coming spring.