Not yet. Air power is not my forte (i wish it were abstracted...), and I don't know if there really is anything to balance there. Suggestions are welcome.
I have to say I haven't studied it to nitpicking level but overall aerial situation in '44 scenario is fine. Only odd thing around is that one of the fighter squadrons on the eastern front is actually basic turbojet fighter even though the first 'real' turbojet squadron Kommando Nowotny was formed up in September '44.
Oh, and that squadron I mentioned is a german one