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I have a 2013 4 stroke 9.8 Tohatsu on a 14' jon boat. Motor came with a 7.5 pitch prop which does great with just me and my son in the boat. Turning 6000 RPM's. Problem is when I load the family, gear, and 100 pound Lab I drop down to 5300 RPM's and about half the top end speed. My question is...