There are a whole bunch of fighters that could stand to use a small perk cost. I could see why the Spit14 would cost 1 or 2, but not 7 or whatever it is. At one time, the P47N and Ta162 were perked as well. HTC woke up. Sooner or later they will drastically reduce the perk price or remove it all together for the Spit14.
What I fail to comprehend is how the Spit14 is perked, yet the P51D, Spit16, La7, and possibly a few others are not perked. Just add up the "good and best" of each plane and tell me which aircraft of the 4 mentioned in this paragraph really out class the others at anything. Figure out why the Spit14 is perked and let me know.