I was between 5100' and 5400' feet the entire time, well above the required 4900'. Something needs to be checked.
Something to consider is that the allied bomber base is quite a bit farther from the front lines than the german, more than twice as far in fact.
Also notice that the german targets are almost all along a single river, with 1 target being near the allied bomber base every other time. Germans only have to make 1 plan, and modify it very slightly if at all.