Botabing,
Yes, you have kills in 10 different fighters, but look at the fighters you have kills in:
N1K2 77 kills: This is the worst perk getter of AH. With its ENY of 10, if you shoot down a Mossie or C.205 you get a whopping .25 points. Conversely, if you're in a Mossie, C.205 or any other aircraft with a 40 ENY, you get 4 points for shooting down the N1K2. That is 16 times as many perk points.
The Spit IX is just as bad as the N1K2. The F4U-1D ain't much better.
You need to fly aircraft with high ENY values. Try things like Bf109F-4s, Bf109G-2s, F4U-1s, Hurricane Mk IICs, Mosquito Mk VIs, P-47D-11s, C.205s, Ki-61s, La-5FNs, P-51Bs, Fw190A-5s and Yak-9Ts. I think that you'll find at least a few aircraft that you like in there, all of those are pretty easy to use, and your perk points will climb much, much, much faster.
Try them out, they're not that much harder to be successful in than the N1K2, Spitfire Mk IX and F4U-1D.