All late war fighters should be perked.
Either that, or all should be unperked.
Sure.
The F4U-4 is a great plane. It might even be the 'best' plane as Widewing puts it. But seriously now, how much of a performance margin does it have over its contemporary late-war fighters that is large enough to justify its current perk price, when all the monsters such as the 109K-4, 190D-9, P-51D, La-7 and etc. are not perked at all?
Compare the F6F-5 and the A6M5. Both are contemporary mid-war fighters. Aside from turn performance and sustained climb rate (perhaps acceleration too), the F6F-5 simply dominates the A6M5 in overall performance attributes that concerns aerial combat. It is faster, rolls better, dives better, tougher, better armament, better handling at high speeds etc etc etc etc.. It can tactically dominate the fight, with the only possible reason of being shot down coming from only the pilot himself.
So, would you say the difference between the La-7 and the F4U-4 is even larger than the A6M5 and the F4U-4? The 'superiority' of the F4U-4 over other late war fighters is clearly not something that justifies its current perk price. In terms of performance if the F4U-4 is perk material than so is the La-7, Typhoon IB('44), Fw190D-9, Bf109K-4, P-51D, P-47N, and etc etc.
However for some reason the 4hog stays perked, the same with the Spit14, which would be the Ta152 to the Fw190D-9. Who cares if the Spit14 outperforms the Spit16 at 25k? Who cares if the Ta152H-1 outperforms the Fw190D-9 at 35k? At the altitudes where it really matters in the MA both the Spit16 and the Fw190D-9 is much superior to the Spit14 and the Ta152H-1 - except for some reason the planes that perform better remain perked, and the planes that performs even worse are perked.
At least the Ta152H-1 and the F4U-1C has grounds to be perked in the fact that it was a rare fighter...(in which case so should the N1K be perked). Why's the Spit14 perked in the first place?
I say unperk the Spit14, Ta152H-1, and the F4U-1C, F4U-4.
UTSTAFF!!!
..either that, or slap a modest perk price on all the contemporary late-war fighters in the game that maintains comparable performance to the currently perked fighters, but for some reason remains unperked.