22k wind downdraft anyone?
Personally I would like that lifted to whatever the pilots deem appropriate.
What I try to accomplish in a Scenario design is that a person who flies in it would, if he read a book on first-hand accounts of flying in the actual battle, feel that his flying experience in the Scenario is very similar to the type of action he read about.
For most battles, I read books of 1st-hand accounts of the action to get an idea of what things are like, then I work on a design where I'm trying to make the action be like that.
With respect to altitude in North Africa, I got the books listed in the references section of the writeup and searched (for the Kindle books) every single mention of altitude. There were no references to anything above 20k. Like Dnieper, the vast majority of the action (including fighter sweeps, bomber alts, etc.) was much lower than that.
When a Scenario has no downwind, fighter action gets way up there. That is true of 8th-AF style events (where that's how it should be), but it is also true of other things (Malta, for example) where it shouldn't. It's because we have things like visibility bonuses that real WWII pilots didn't, perfect maps, no mobile concentrations of troops and vehicles, and in-cockpit GPS. In North Africa, it is wildly non-historical and not at all a realistic combat experience to by flying around way above 20k.