For starters, I think having perked aircaft is a good idea. However, I do believe that there are multiple planes that are perked that should not be and there are a few planes that are not that should be. Below is a few examples:
The Spit16 vs the Spit14. Very similar planes under 25k, with a slight edge going to the Spit16 under that alt (roll, turn, accel). Only at 25k+ does the Spit14 really seperate itself from the Spit16. Below 25k, not only is the Spit14 slightly lessor than the Spit16, it is very much on par with the Spit8 and Spit9. Unperk the Spit14 and/or perk the Spit16. Like many, I do not understand the logic behind perking the 14 and not the 16.
The La7. What other plane can go as fast, turn as sharp, accelerate as well, and be armed with three 20mm cannons? If HTC is into perking the top end rides, then this planes fits the bill.
The Nik2. The only thing it cant do is dive beyond 400mph. Otherwise this is another monster that can do it all very well. The four 20mm cannon have enough ammo to take down a CV (figuratively).
I for one do not think the P51D is a dominating plane. It have several weak points and unless the player knows how to take full advantage of its srengths the P51D isnt much more than just a fast plane with average firepower. Leave it as is. No perk needed.
Why HTC would perk any of the F4U-x is a mystery to me. When someone can pick up an La7/Nik2/Spit16 and so easily swing into action and do well, but yet everyone knows any of the "hogs" are not easy planes to fly in the least bit. They are fast and can carry some massive firepower and some good ords, but it turns like a hog in a livestock pen, rolls like a hog in the mud, and climbs like a fat lady on a ladder. So unperk both the F4U models.
One last thing: the ENY could use and adjustment. Maybe lower some of the planes that are dominating even further? Ditto for the OBJ modifier. There are planes that we meant to dive bomb and take out ground targets and they receive no more benefit vs something that wasnt meant to point anything at the ground. If a Mossi takes out a building, it should receive more of a OBJ modifier than an aircraft that had a sole purpose to shoot down bombers (109K-4, 190D-9, etc). There are a lot of aircraft that could benefit from a more accurate and true to their role scoring system. There are far too many "10 OBJ" modifiers.
A big question I have is why not adjust the ENY and OBJ scores based on monthly stats??? Rotate and/or adjust based on the usage and success. If the La7/Spit16/Nik2 continously dominate the arenas... that should say something.