Since it is a campaign setting, you can't just up and change your list unless you restart. Changing his list could take a grueling amount of games to grind out the changes but then if you aren't having fun, why bother?
We started a RitR campaign and IMMEDIATELY ran into that "no fun" problem of players bringing the biggest ships they could. We played two rounds and restarted the whole campaign with a house rule of no large bases allowed. It mades things a lot more fun for everyone; the fleet builds were more creative and a lot of our otherwise under used ships hit the table.