It takes a bit of forethought to kill the ords in the immediate area, and a bit more to think that bombers may come from a sector or more away. So, yes, and no....depending upon the map. Maps do make a difference.
Hardening CVs more, or increasing it's ack coverage more would do more harm than good. As it is, Jabos are ineffective unless massed, or following upon near misses by bombers, and thats only if they don't get picked off at 15K by the CVs ack. It wasn't Bombers that killed CVs in WWII...it was Dive Bombers...JABOs...Level bombers like the B24s, B17s, Lancs, etc, proved to be ineffective. In Aces High, the reverse seems to be true; level bombers effective...Jabos...ineffecti ve.
Here is a suggestion:
Instead of hardening the CV more...reduce it to 3k tonnage to sink it.
But! Before the CV takes any damage, ALL of her escourts must be sunk first! Destroyers take say...1K to sink...and the Cruiser 2K to sink...and this BEFORE the CV incurs ANY damage at all.
Thus, to sink the CV you must first sink four (4) destroyers at 1 K each (total of 4K tonnage) AND the Cruiser (CA) at 2K, for a total of 6K of tonnage upon the Fleet and the CV is then pretty much defensless except for her fighter groups, and should go down with 3K tonnage upon it, or, at the very LEAST, DISABLE its air and amphipbious operations for a very minumum of 30 minutes, and require an additional 3K of ordnance to positively sink it.
What this does is allow CVs to operate with near impunity until her escorts are gone...and then she must rely upon her airarm to protect her. It also gives JABOs the chance to fullfill missions they really flew, and bombers can still sink undefended CVs.
As for the ack...it's deadly enough for the 8K of tonnage being currently required to sink a defended CV. It's effectivity should be reduce by a factor of each escorts' ability to defend.
Just some thoughts.