Here's a recommendation. Any perk plane should always have a unique identifier. If we get a perked Spitfire, it shouldn't be a Spit, it should be a SP14 or SP21 or something. A P-51H shouldn't be a P-51, it should be P51H. A Yak-3 (if perked) shouldn't be a YAK, but a YAK3.
IF perk rides are by nature so "unbalancing" as to require being perked, then they shouldn't have the advantage of making the enemy wonder if they're a perk or not. ALL perk planes should always have a big sign on them saying "I'm a perk plane; come kill me!" (In other words, they should have a unique tag.)
And yes, if they perk the F4U-1C, change the designation to F4UC.
This isn't really an issue yet, as all current perk planes DO have a unique identifier. I hope that doesn't change.
J_A_B