Sketch: 90% of the gun cam footage from LW planes in WW2 shows rear angle attacks, and most of them get pulled off without instantly being shot down (like would happen in AH).
Also, LW units had their pick of bombers. In massive US air raids, the bombers would be scattered from 25k to 15k, many many miles wide and long. The LW would concentrate 1 squadron on 1 small group of bombers. Perhaps compared to the entire mission the allies were not outnumbered, but compared to the isolated group the LW was attacking at any given moment? Perhaps they were (*shrug*)