I am not sure this is the best way to go but at the moment I do have to agree that large capital ships are pretty useless. Cruisers seem to man-handle them and any derp can get enough bombers together whenever the time is needed to kill one, which is not that many. Three or four bomber pilots who know what a keyboard is can best a skilled battleship captain who has piloted one for years.
I just do not know what to suggest as an alternative. Right now battleships just lumber about and can't do anything against anything that is not a battleship, unless some moron gets within 200m of one with a cruiser.
Large capital ship battles should be slowed down as well, so they do not last just two minutes.