Mustang 3 and P-51D are only the 2 best fighters of the game. To me Fw 190 D-9 is only almost as good as the D5NT/NA. And to do that the 51 doesnt need any modifications...
If you put planes and players into historical situations flown historically, even without putting the worse pilots to German side, you can expect, and you will get, historical results.
If you test Ai vs. Ai I-16 type 24 is the best fighter of WW2