Wait...
those charts say, the P39 Q-25 was drastically different from the AH version, like 25-30mph faster (!)
Im not a fan of this bird, but if it would be faster, it might be more popular in the MA, bringing some variety to the spit16/la7/ponyD world.
So i think it would be a good idea to change it from the Q-5 to the Q25/30, as we already have an early war, much slower P39, the D model.