Gillie is absolutely right. You may have to go to a 19" depending on loaded weight and CG. If you can swing the Suzuki 16"D X 20"P four-blade stainless, that may be right where you need to be. Power Tech also makes a great 16"X20" 4B SS prop (called the LFS4) with a good stern-lifting rake progression.
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Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.
Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!
Currently without a SeaCraft 
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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