If you had a plane with a lousy cockpit view (that interfered with aiming and shooting, and SA), terrible ballistics, awful gas mileage because of a tiny fuel tank, had no drop tanks, performed worse than bad over 20K, and that carried pitiful ordinance, would you perk it?
Almost any American late war ride is an uber plane next to that list of deficiencies, but I don't see any demand to perk the P51D for example. Next to the LA7, the P51D is 'way uber because of its versatility, and it can eat the La-7 for lunch. So the La-7 can run away. Big deal.
Leave the La7 alone. It's a niche fighter at best. The only things it has going for it are speed and a reasonable ammo load. It's a terrible dogfighter, but when the horde visits, it has its uses as a base defender. What's it's K/D ratio these days anyway?