Seeker, this is the CT, not the MA. planes are perked here not just based on their performance, but also based on their historical usage values. In the BoB, Hurricanes were more common than Spitfires, and did more than Spits supposedly. The Spitfire just got all the glory. (this is general opinion if I'm not mistaken)
Now don't you start bringing out the Luftwhiner label for me. In a BoB setup, I'm flying RAF unless the numbers are just so skewed that I have to fly Axis. I love Spitfires, and dang it, I want that Mk 1A more than any other European theater plane we don't have (ok, maybe a the LF version of the Spit V with the C wing so I can choose which armament I want between 8 brownings, 4 brownings/ 2 hispanos, or 4 hispanos!). However, I realize the importance of the Hurri Ia in the BoB and would not object to a 1-2 point perk on the Spitfire 1a in this setup.
The Spit I, Spit V and Spit IX have no business being perked in the Main Arena. This, however, is not the MA, this is the CT and more specifically a setup for the Battle of Britain. The Hurricane was the most used plane in that conflict, not the Spitfire. You leave the Spit I unperked and you'll see a 90% ratio of Spits in the setup once it goes live. Ya don't believe me, just look at the current CT and MA. Can't go anywhere without seeing Spitfires.
If anything a compromise. Spits perked for the first half of the BoB "tour" then unperked for the second half.