Failed how?
By repeatedly using an argument that really has nothing to do with puffy ack lethality.
Getting killed by random computer generator is fun to you? 
This is a game, people look to have fun, not a sim where everything is as realistic as possible.
Getting shot down by acks is a risk I take for getting close to a CV, field or strat target. It sucks when I get shot down but it's the risk I take. I'm also willing to venture that if it was just purely manned acks that you'd find another reason to nerf acks because you don't like it when acks shoot you down. Endless cycle.
If the defenders had any intentions of keeping the CV, they would jump in the manned 5" guns, which is probably even more deadly than the AI guns right now. But the fact that I'm being killed by a person and not some random computer makes it "fun" for the shooter, and for the guy trying to kill the CV.
The AI is a game play concession because you will not have a CV that is 100% manned in order to defend itself if there wasn't an AI to help with the defense.
Parking the CV off shore limits the defender's ability to defend. Again, You can't go above 3K without risking getting blown up instantly.
Again, apples and oranges as parking a CV off shore has nothing to do with the lethality of the acks. If you were to park the CV 4 sectors off shore, the lethality of the acks would still be the same. That is why your argument has failed repeatedly.
The simple fact is, the wish to nerf puffy acks has nothing to do with anything else other than making it easier for people to attack the CV without very little risk to themselves.
ack-ack