The point is:
CV ack does deadly hits to fighters, no matter how far away they are and no matter how much you are evading.
I'd expect it would get at least more inaccurate at distance, but this seems not to be the case.
Flying a fighter you can only game around it by flying lower than somebody else, so the ack concentrates its fires on him or her.
In contrast, I did a lot of bombing runs on CVs recently in B-17s/26s and I never got any hits in those (maybe a fuel or oil leak at best), except from manned 5" mosty right above the CV.
Programmed ack simply can't hit anything that flies slow on a linear course.
The CV or field auto acks always concentrating on a single target (the highest one) is another issue...
Cheers,
Vasco