Although the amount flotation in a bracket at rest may determine whether or not a boat will self bail at the dock, the flotation advantage disappears when you're up on plane. The much more important metric is one that you can't see, i.e., what moving the motor ~30" further aft does to your boat's CG! Motor weight is a large part of that, so lightweight 2-strokes have a significant advantage for use on a bracket!
CG location/boat balance is the single most important factor affecting your boats performance, as that will determine min planing speed, how well it rides in a chop and the boat's tendency to porpoise.
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