Welcome to CSC. You free diving or tanking?
Any way to add a floatation chamber under the bracket? The 225 is pretty heavy(not sure about the weight of the 175) and either is way more power than you need, even loaded to the max with divers and gear . The weight in the stern, especially on a bracket, will make it hard to plane slow, even with tabs. Divers climbing over the stern with that set up will make it very tail heavy. You would need to be careful to put a lot of weight forward, ice boxes, tanks, etc.
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