I have no idea why but the bot tailgunner on the XA-38 is really good. I just let it cook and try to get the nose up if they are behind me or nose down if they are in front.
I have tried just about all of the planes in all nations, and this is the best for auto tailgunner.
But the lack of all controls for the pilot (flying, MG and bombs) is no where the simplicity of the XA38. B25 is good but having to switchback and forth for MG and bombs, makes it harder.