The spit doesn't seem overmodelled to me. Should turn great - does. Climb great - does. Good acceleration - has it. A bit fragile - is. Nice top speed - has.
51's may be slightly overmodelled, but if so it's in the acceleration category. Its sustained climb is about right from the specs I've seen. Zoom climb is simply outrageous - and in RL it was. The ability to accelerate as fast as a spit at 10k with 100% fuel is what has me wondering, though.
I don't think it's so much that they're in the
uber category as that a few planes are in the
unter category. And you know what? Pyro said he'll look into it, because it does look suspect

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129 IAP VVS RKKA