Problem is imo in the way CV:s are used. when u are running them all the way up on the shore they become very vulnerable. Especially when there is no cap over them to prevent bombers from going in. A real world CV would see the same faith. After all, the Japanese navy carriers where defeated by SBD:s. Keep CV away from shore and they live longer. More F4U-4:s will not change that much.
The ability to launch LVT:s should not be dependant on how close CV is to shore, adding some sort of "landing fleet" should make a lot fore the CV:s abillity to survive. Maybe some destroyers escorting a few transport ships that LVT:s are launched from.