"being attacked by a relatively small number of Axis fighters"
We cant go near strictly historical OOB ratios in many FSOs (not all, I said many...) the howls of protest would be deafening, from either Allied or Axis sides. We need to make it historical AND playable, and that is sometimes a fine rope to walk over, but we do try.
What you have to appreciate is that air combat in WW2 often went along the lines of this: Side #1 has 10 squadrons of bombers and 10 squadrons of escorts attacking 5 targets. Side #2 has 5 squadrons in the area of defending fighters, and intercepts 3 of the 5 raids, ignoring the other 2. That was real life. In FSO, the other 6 squads from side #1 (3 bombers and 3 fighter) would see no enemy a/c in the frame, and they would complain about "lack of action". So thats the problem; if you guys ask for "ultimate realism" understand what you are asking for. It means missions flown with a good chance of seeing *nothing* but some flak. Thats not the only problem, but its one of them.
Add to that that most air combats involved only a few passes on each other before disengaging, often only damaging @ 10 percent of the other force, and maybe, maybe on a good day, shooting down 2-5 percent on a mission. Out of 300 bombers, you would damage 30 and shoot down 15 lets say. That would be considered "heavy" action.