Some maps the guns are very accurate, and some maps low. Most are middle of the road.
I assumed ack accuracy for the MA is a global setting. If it is different from map to map I would call that wrong. It should be a global, not varying.
If you are right, was that part of the map updates?
JimmyD says they were not changed. But I noticed something changed. Almost every sortie I make involves acks, so something it noticeable. I don’t think it has much to do with plane other than its size as a bigger target. Bigger the plane, easier to hit.