Ehh, id maybe lower the k4, yak3, and 190D to 6 ENY or so. The spit16 is what should be perked. I dokt think the Ta52 or 110 should be perked. They have their weaknesses.
The planes that I wish would be perked are B26s and Tu2s. Always ruining the CV fights. B26s near impossible to take down without 4 cannons and are fast as hell. The TUs can dog fight, are fast as hell, and have nasty front cannons.