I have been thinking something similar for quite some time. Here is my formula:
(Your ride's ENY value Times the enemy pilot's current KD {in Fighters, Bombers, GVs or Attack})
Divided By
(The enemie pilot's ride ENY value)
Example,
You kill Fester in your 202 VS his 262:
(50 X 14.1) [202's ENY is 50 & Fester's Fighter K/D is 14.1]
___________
5 . . . [262's ENY is 5]
=141 perk points!
Kill him in your 262, you get 14.1 perks.
Kill him in any Fighter Vs. Fighter of the same value and you get 14.1 perks... I.E. F6F Vs. F6F
If he were to kill you in the 202 Vs. 262 example, and you had a K/D of 1, he would get .1 perks. So would anyone else who killed your 202 in their 262.
He (or anyone) kills a newbie (with a K/D of .1) flying a 202 with a 262 and you only get .01 perks.
Most examples would not be this extream, since the average K/D of all pilots, per plane lost, is a bit under 1.
eskimo