that asked about the Ki-100 and its need for a perk
The myth that just won't die. The Ki-100 was marginally better than a Ki-61. It's top speed is @ 370 mph at alt and in no way would it ever need perking. The two best fighters in WW2 that the Japanese flew are already here; the Ki-84 and the N1K2-J and neither are perked. The J2M would be an interesting addition to the game but it won't be perked either.
LA-7 (including the 3 cannon option), Bf 109K-4, Fw 190D-9, N1K2-J, Ki-84, P-51D. All unperked. A Ki-100 isn't going to be unless HTC models it with lazers and a jet pack.
G.55? mmm, no.
A-26 Intruder? yes I can see that but that's off topic as it's USA.
Can't think of any really not from the smaller countries.