Quote W.E Johns. WW1 Pilot and reserve officer in WW2
"Archie is scattered and rarely hits anything, most gunners when they fire shoot straight at the target and most hits are registered in the fueselage or rear of the aircraft"
For someone who had more flying experience than us cartoon pilots and served in both World Wars, Im likely to take his word over yours Ack-Ack.
Also, note that the muzzle velocity of an Anti Air gun is slower due to the fact that they are A. firing against gravity, B. they start at ground level so there is denser air, C. a 20 mm flak gun takes time to change the trajectory of its fire, so it would take constant adjustment to fire at a fast moving aircraft at high altitude. Too long for any accurate shooting to be made, D. the fact that German AA and British Late War AA was so effective because it was radar guided is not to be ignored, E. the lower you fly the less effective the ack should be, not more effective, as you are moving too fast and close for effective shooting to be made, there should be a "butter zone" where Ack is most effective, anything above or below that zone should be harder to hit.
So, I put forward that AA fire should be more complexly modeled to add a greater tactical aspect. Pilots would come in ultra high or Ultra low to dodge AA fire, but on AH2 its modeled that besides range, its instant death almost to fly through it. at any altitude within its range, let alone the puff ack that kills you in one hit from 30 K.
A. Add a buffer zone in which AA fire is at its maximum efficieny, anywhere below, or higher than that zone is harder to hit, say if you go in NOE, your almost impossible to hit, and ultra high your out of range. In between these is the buffer zone which should be almost certain death if you spend too much time at too slower speed.
B. Make the Dar a tactical target. So if a bomb takes out the Dar, it renders no assistance to ack. This of course both ways, so if the dar is up, your gonna die, if its down, you have an easy time. In short, Dar up, your toast. Dar down, cakewalk. (almost unless you fly through the zone)
I think these two things would make a GREAT addition to the game, it would add a whole new perspective to base taking.