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Porpoising can be exacerbated by weight in the stern. A Yamaha 70 hp 4 stroke motor is not light.

While one can play with a foil or tabs, it is recommended to review the weight distribution in the boat. While your options are limited on a Dauntless 15, a review is warranted never the less.

One way to see the effect of weight balance is to have a passenger in the bow and go from a standing start to a cruising speed.