I do have a couple of sugestions:
-the battleship Nelson should be slower. It was very tough and well armed, but it was notoriously slow, only 23-24 knots, at a time when everyone else was building BBs doing 27-29 (and even faster in 1940-45). The ship spent the war escorting convoys and doing naval bombardment, because it was too slow for any other duty. I would suggest changing the speed to 5.
-the Hood is too strong, defence-wise. At 16, it's defense rating is almost as good as the King George V, a far more modern ship. The Hood had WWI armour, which is what killed it. I would suggest dropping it's defence rating to 14, the same as a WWI dreadnought.