Recurrent theme.
Carrier hardness is not the problem.
The way carriers are used in this game by the players is.
* TG's are run right up onto bases that still have ord, onto the spawn points of PT's with torps, and into easy range of operational shore batteries. Boom. I've seen a full court vulch off a CV that was repeatedly getting hammered by SB's, and no-one would lift ord to kill the SB. Usually ends in: "oh...the CV just went down.....awwww...."
* Combat operations are run with no high, middle, or low CAP over the CV while everyone flies off to vulch and furball to the nearest enemy base. Of course bombers are more effective vs CV's than in WWII.... no opposition.
* TG commanders will send a CV deep to "sneak" a base, while some yahoo will lift from it way early and give away it's position on dar.
The best solution to help CV's that' I've seen would be adding 3 picket destroyers with their own radar rings at distance from the CV.... holding station, and doing their best to avoid closing on land. To do this, they would have to be fast, and pivot around the CV group at some distance, keeping as far from land as they could manage in the process, as well as maintaining a minimum distance between each other around the picket line.
This at least extends dar without having to increase dar for airfields too, or separating the two radars in game to allow CV pilots *some* chance at interception of the incoming bombers, since few are ever willing to patrol for them.