Naval warfare in WW2 is definitely not my area of expertise, but from what I gather from all the posting here, naval assets should get a combined arms bonus. Yes, evading bombs or torpedoes is pretty doable on their own. That's why you do both, and have heavy ships shelling as well. They can't dodge everything, and if they do try to dodge your aerial power, your heavy ships will close in and deal the final blow.
Combining NAVs, CAS and capital ships should bring the bests results (cpt. Obvious I guess).