Statistics alone are deceiving. All last night the Allies had a numbers advantage somewhere in the 20 vs 30 range yet they were consistantly outnumbered in the AIR, that is not a problem with the plane set. Stop sending half your numbers (not meaning you personally, the figurative "you") up north to grab irrelevant bases while leaving your southern comrads outnumbered and that will change.
I do not disagree that the setup may be unbalanced, but it is not as bad as Hungary was, much better in fact, because the Allies there had both the fastest and best turning plane, but I didnt hear any Allied complaints then. This set the Axis has the best turning plane, while the Allies have a clearly faster plane. Flown properly (I am not infering you do not know how to properly fly it Hawk, I know you do) the P-38 should totally dictate when and where to engage or disengage. The P-38 has a 30 MPH advantage on the Ki61 and a 20 MPH advantage on the Niki, and that is at sea level, the difference gets wider as alt climbs. Stay fast and you should have no problem, get slow and you will die.