The Iowa class battleships would make the most sense.......
Maybe making diffrent sorts of fleets could solve the problem.....
Ex: 3 Destroyers, 2 Cruisers and a Battleship (30% chance) or say 1 CV, 3 destroyers and 2 cruisers (60% chance) or maybe 1 Battleship, 1 cv, 3 Destroyers and a Heavy Crusier (10% chance).
All i gotta say..........