The CV I carriers in core are buildt in 90 days, in contrast to a CV II or CV III, which are buildt in 700+ days. The CV I's are of course weaker, but not that much weaker, are they? I tried to build a fleet as Germany in my first CORE game, and ended up with 15 CV I's + CAG's, (with support ships of course) and they had no problems whatsoever smashing the AI contolled fleets. With modent CAG's they seem quite potent. Maybe they shouldnt be able to use anything but the first CAG's? I presume that would be hard to fix, without making a new type of brigade? Or maybe I've missed something now, since I havent tried this in multiplayer games?