sorry peter but you can not argue with realistic here. Because you cant kill ships with artilly for example..in real life ships are very carefull attacking a coastal fortress. anyway i dont know if the hitpoinst reflect the difficulty to be hit...
i would 1. When patrol rdius is changed, Planes need to refuel 2. Hitpoints of Airplanes in the air must be reduced. There is no reason why they have more then tanks. 3. Flaks need to be stronger of have more hitpoints and a attack and/or defense radius.