I would get rid of all the perked planes except for the side with fewest numbers, but that's another discussion. The truth is, 262s, Tempests, and -4s DO ruin good fights. When I see them unless they are flying incredibly stupid, I just leave and fight elsewhere, and if there is no elsewhere with a fight, I log off. I make no apologies for not being good enough of a pilot to win against them, and when I die to a machine instead of to a pilot, the only thing I learn to do better is to leave the area sooner.
I would get rid of the Spit 16. It IS a training wheels plane, except in this game you learn nothing but bad habits with your training wheels. I hear another Spit would be just as bad or worse, but I think the 16 gets the most attention because it has the biggest number after the name. But that doesn't change my choice, I'd still get rid of it.