We've got a plane doing 378mph at deck, 10minutes of WEP duration, 3x20mms... for free..
A plane that does 380mph at deck, quad Hizookas, for free...
A plane that does 375mph at deck... for free,,
A plane doing 365mph at deck, with 10 minutes of WEP, and initial 4,500fpm+ climbrate and a 30mm cannon.. for free.
..and a chuckload of contemporary superplanes, for free.
There's no reason the Spit14 should be unperked, or rather, no reason why other superplanes shouldn't be perked. In terms of balance, as long as planes like the P-51D, Bf109K-4, La-7, Fw190D-9, Typh.. etc. remain free, there's no justifying the perks on the Spit14 and the F4U-4.
The Ta-152H is finally free. One down, two more to go for UTSTAFF