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In re-reading a few posts, I think we have gotten off track and muddled some specifications.

A jack plate is an appendage that allows the motor to be mounted to a plate that can be raised or lowered either by a mechanical device (screw) or by hydraulics.

A set back bracket is an appendage that allows a motor to be installed a set distance "back" behind the transom.

Using a set back bracket can exacerbate the tendency for a hull to squat (due to added weight) and/or porpoise while underway.

To reduce water over the transom of a hull, one could look at reducing the weight in the stern and/or installing splash door(s).