A game is meant to be fun and fair, war is meant to be neither. So when you start off with uneven hence unfair sides, you will never have a fun or fair game.
I guess we can try to make it fair? is it posible to make the ally forces base more vulnerable to bombs. Let say a regular FH hanger would take 2.5 1000 lbs to go down. In this new arena let the ally base FH only take 1 lbs for it to go down. While axis hanger remain 2.5 1000 lbs to go down. This way the axis bombers become more effective, and so are there attack air crafts. A FW-190F8 would be like a P-51D or P47 in term of ground destruction power. Just an idea anywho.