About the capital ships, I would suggest removing them entirely and making Gunships/orcas your maximum level craft. So you'll fly sea serpents, Hammer heads, mantas, BH Bombers and the two gunboats.
Why? Well, you don't need battlecruisers to take on other capitals, bombers can do it as well, plus are in-character. The capitals are for the Core, and the Core don't take bounties.