Decrease the pitch and you will move slower. However, you will achieve a higher rpm when you are wide open. Possible to over rev that little beast when you are cruising.
Unlikely that you have a tach on it to tell.
I have one of these on a 14' fiberglass skiff and it is a great little rig!
US Navy has a perfect record in aviation. The probability of survival is equal to the angle of arrival.
26 TV Weekender 04 Suzi 2012 175
37' Lafitte 87 Cummins 6BTAM2
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50' Chandeluer Lugger 60 Detroit 671N
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19.6' Aquasport 77 Evinrude 140
1092' Newport News 77 Twin Reactor (Fly One ROCKS)