I'm not objecting your wish, but I hardly think it would have the result you are hoping for.
I doubt that there are many players that do choose their bomber because of OBJ. I would even go so far as to claim that the meaning of the OBJ value is one of the most unknown things in game
As to fighters, I also think further increase of ENY would get more players into that planes, especially the current ENY 40 rides like Spit I or 109E. I don't believe there will be a considerable number of pilots jumping from P51D or Spit XVI to a Hurri I if they get 10 or 15 perks instead of the current 8 for a N1K kill.
In regards to perk farming, it seems like players are looking for some "weak points" in the ENY system, highly capable planes with a reasonable high ENY - 190A8, 109G2 (ENY 30) or mid-range like Spit IX, P38's or even 109K4 (all 20-25 ENY).
The few players that do fly Spit I or 109E usually don't fly them for perks - either they have no clue, or they are doing it for the fun alone (and many of that kind of pilots are actually quite good and don't need that perks anyway).