Spit8 to eny15, spit16 to eny5 and perked? Do you know whats the difference between those 2 planes? Literally, almost nothing, if you can do something in the 16, you will be able to do the same in the 8.
K4 perked? Why so? Its fast and can climb but pretty poor in everything else. If youre flying it in a non-timid way, one of the most difficult ones to fly. In the righ hands it can beat anything tho...
Pony: perking it would just inspire timidity if thats even possible. Personally i would rather get jumped by multiple spixies than one pony, they are as boring.
Spit14: compare it to the pony. The only thing the pony has is range and dive speed. Very strong all around aircraft. Definiately eny5, but its perk price may be lowered.
Ki-84: definiately not eny20, rather 12-15ish. Fast like a spixie, has the best flaps ever.
M-jug: the poor many tempest. Equal to the pony in many aspects (low-alt speed, range, dive, turn rate and radius) while better at high alts, in stability and guns. 3400 rounds, WOW
Spit16: ridiculously EZ to fly. Can hang with brewsters, hurricanes and zeeks yet can catch a P-38, a D-jug or the Gustav. IMO deserves a low perk cost but again, theres the timidity problem...
IMO it would be nice if we had eny3 fighters, like the Tempest, 262 and the 4-hog, perked as they already are.