I don't think the perceived imbalance in this map is so much dependent on the air forces, rather than the strange behaviour of the Canadian team. All too often, they behave like the German team once did in an earlier match (see my comment above).
On several matches I have witnessed, the Canadian offensive goes smoothly, until the Factory and the Windmill have been captured. At this point, still bleeding, the Canadian team goes into defence mode. Apart from a couple of backcappers, nobody seems to make a serious push across the river. (Well, in one match the Canadians did eventually take the artillery battery and the farm - too late to have any effect, and still leaving FlaK battery in their back.)
I have seen this result with both Allied and Axis air superiority. Speaking of which, superiority here is more dependent on pilot quality rather the hardware available. A good FH2 pilot learns where the enemy AA is and tries to neutralize that first before attacking tanks or infantry - nothing is more vulnerable than a plane pulling up from an attack run. Also, the Germans rarely manage to hold all AA positions, so the firepower will be quite equal quite soon.
I am still of the opinion that the air war is in balance, the issue is poor tactics and lack of coordination.