Bouyancy should stay the same in any orientation. The boat's mass is the same. Thats gotta be the no free lunch part otherwise we would see tanker ships heeled to reduce wetted surface. Get planing and its a new conversation. One other item, and this was brought up in a patent for heeled hulls is asymetrical shapes. The flow on one side of heeled hull might be different than another, this causes anomolies with control.