2320AD uses the ship design and starship combat system from Traveller D20, rather than D20 Future. 2320AD ships have a lot fewer Hits (SI) because of Trav D20 scaling rules. Divide D20 Future Hits by about 25-50, and do the same for D20 Future starship weapons. I don't have either in front of me, but that's about how the scaling works out.