I think the significant differnce between the Tempest and La-7 boils down to its usage.
More often than not, La-7 pilots don't know how to fight.
More often than not, Tempest pilots don't want to fight.
The first dives in without out a clue and tries to escape via speed.
The second cherry picks off of other fights and then escapes via speed.
Either way, lame behavior abounds....
I say, let's apply a 10 perk requirement to the P-51D, Dora, La-7, 109G-10 and Tiffie. Then reset everyone's perks every tour and let's see what happens... It'll be a whole new world....
My regards,
Widewing