Any disadvantage caused by the P-38's large planform is offset by them being so narrow from dead six, and so incredibly tough besides. Other than pilot kills, I think they are harder to shoot down (in AHII) than Jugs and Corsairs.
Furthermore, while a 38 might not be such a hard kill for a better turner with energy on it, it is difficult to E fight against, because of its lasers and the ability to hang nose up (Reverend Lovejoy voice) forever and ever and eveeeeerrrrrrrrrrrrrrrrrrrrr