Ack-Ack,
The P-38J is a much more powerful aircraft, which given when it was introduced it should be. The P-38G is what you should compare the C.205 too for historical purposes. I don't know what the base ENY for the P-38J is, but the C.205 should get at least two, and probably more, perk points for downing one.
The C.205 is nice, but it seems to have no real strong points, just some good and some average points. This makes it hard for it to compete in the MA against fihgters like the P-38J/L, La-7, Spitfire Mk V, Bf109G-10, P-51, Fw190D-9 or N1K2-J. All of those fighters have very strong points that they can use to beat it while not being outclassed by it in ways that allow it to win.
What happens is that only the more veteran pilots choose the uncommon fighters with any frequency, and that is because they can still win with the handicap. Everybody likes to win. When a rookie gets their rear handed to them by one of these fighters they may give it a try or three thinking there may be something too it, but then they get frusterated and go back to the bluntly powerful fighters. The veterans make the rare fighters seem better than they are.
I recall fooling around with the Mossie in the TA a couple of years ago back when you could shoot eachother down (or maybe it was the DA) and after crushing a guy a few times when he was taking things like Spit XIVs he started taking the Mossie and of course he was absolutely helpless in it. After that I spent about an hour going over the basics with him, but he'd still have been easy meat for any veteran.