GD: Basically I'm getting the same response that you can't control numbers, you can't control numbers, you can't control numbers. Okay, I get that.
However, I disagree with your 109/190 comparison to the spits.
A plane is not a plane is not a plane. Some planes given such generous modeling in this game require less effort to get the same results, and can dominate an arena or setup. Spitfires have a tendency to do that. Add to that B-26s and B-24s to shoot down and 109s all of a sudden don't look so good. 14 formations of B-26s and B-24s last frame alone. Those can be quite hard to take down with a 190 let alone a 109 with a single hub gun.
So I'm just saying, there are an awful lot of spitfires and P-38s.
I retract the comments about numbers imbalance (per your responses above, out of your hands).