The problem with the puffy ack isn't that it exists. It's how it's GENERATED.
Puffy ack needs to be changed so it originates AT the guns, travels the distance to target, THEN explodes. The current modeling allows puffy ack to shoot through hills, and because the bounding box is determined by the size of the target aircraft favors blowing up small craft like fighters rather than bomber formations (the amount of ack doesn't change, only the size of the bounding box. Meaning a fighter has to deal with a MUCH higher concentration of ack than a bomber formation).