Very rarely get killed by ack myself, even while divebombing. Say what you will about my style, I'm a back-shooter alright, but at least I shoot 90% of my ducks on the wing...
I've seen the situation where "ack running" is typical...large horde hanging over a few low-E bandits. Hell, if 5 friendlies are so stupid as to get shot down by the acks a Hurricane is weaving amongst down there,(I've seen it happen) I almost got to cheer for the Hurricane. If you want the base, bomb the crap out of it or de-ack it. If you want a fight, let 'em get a sporting amount of alt and "meet in the middle". If you can't run-down something before it gets in the ack, consider taking a faster plane.