I've mentioned this before, as a tip to Admins, there is a method to applying squads to sides that allows you to use squads that typically go under and over on sides you want to emphasize a perceived advantage or disadvantage.
In this FSO, seeking a 50/50 split, I would try to place squads that usually come in low on the Allied side, while placing squads that might typically come in high over on the Axis side.
It's just another way to tweak numbers for better play, it's not the easiest way to do it, but is something that should always be kept in mind when your plane set might not be the most desirable for a certain side.
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