I wonder how many people ever get 20+ perks in a single sortie. I'm guessing less than one half of one percent of all sorties even end over 10 perks.
I generally run into the 30/40 perks per sortie, this is common since my plane of choice is a P38J and C.205 - also the main reason is I generally target lower then 10 eny aircraft (spit16s and la7s are my prime targets as well as P51s if they are lower then me).
I averaged out 5 random c.205 missions I flew last night - and screenshot the perk results:
C202: 6 victories 20.13 perks x 1.01 perk modifier
C205: 7 victories 25.60 perks x 0.87 pm
C205: 6 victories 16.99 perks x 0.80
c205: 7 victories 12.63 perks x 1.10
C205: 3 victories 11.58 perks x 0.89
C205: 14 victories 32.03 perks x 0.97
On Average this is 19.82 perks a run, on an average of 0.94 perk modifier
Now these numbers are just my average results, which would be clearly superior then a newer player, what I am trying to get at is a newer pilot would not come close to these numbers on a daily basis. I would say most likely cut these numbers in half, or even a third to get a closer idea.
While true it would only take 3 sorties for a Tempest with these numbers, problem is a newer pilot would have a tough time even reaching 10 perks a sortie, however It took me years to garnish the skill level to effectively fly and survive (as you need to kill and land to achieve the total perks).
I would say 10 perks if landed, and cut that in third if he dies which leads to hardly any perks for a newer player to really be interested in perk farming.