to stop NOE attacks on HQ there should be a ring (or 2) of ack (37mm and 88?) about 1 mile out from it, so you get almost murderd by 37mm, if you are below 6k, and if your above that alt, the 88s should be firing. I find HQ runs a tad boring, no one ups normal fighters hardly these days, its all 163 or nothing. Then theres very little auto defence, as if you could fly over germany during the day in 1944 without having flak follow you....
but then i also think flak should be alittle more random. IE if theres 10 buffs ib, it should be really thick and painful, if theres one it should be as it is now almost useless.