S!
N1K2-J needs not to be perked if the FM is revised IMO.U can outrun it and beat it at high alt.But it is the FM at it's current state making it a bit frustrating plane to battle against.
Perking Dora?Must be kidding...It is fast but so is the P51.Just need to perk it because it can run away from You?Dora needs a skilled pilot to take out the most of it and still it loses the game if caught low&slow.
P51D as perk.No reason.They are fast,but just evolve a proper counter tactic for their B&Z (and then they run after initiative is lost

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Perk 109G-10?It can't turn well against most of the fighters and has no turbolasers...It is true it is very fast and can dominate the B&Z at will.But hey...Again..perk it because it can run away?
La7 is a cheap perk IMO,max 5 points or so.It is not that uber as thought,just very fast low down and can do some tight instant turns,but loses a lot of E too doing them...
Just my 2 cents based on what I have experienced with these planes...
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DB603
3.Lentue
Lentolaivue 34