Oh, by the way... the Ki-84 won't be perked.
It is kind of a cross between a Spit-9 and an La-7 unless I'm to far off.
It'll be more manueverable than the La-7, but not as fast, and faster but less manueverable than the Spit-9. It'll have better guns that the La-7, but less firepower than the Spit-9.
Under 10k how fast is it? That is where it matters.