BnZ - I'm just saying you can't just extrapolate what the P40 k/d would be from where the stats stand right now. The point is that you've got a soup of elements with a variety of attributes, and it's all interdependent. Change one and everything changes in concert. None of the elements are in a vacuum.
Grizz - What's the question exactly?
47/51/152 for buffs... I dunno, they're pretty close overall. The differences are in how you mean to kill the bombers.. Some passes are easier and/or more lethal in the 152, and others are easier and/or more lethal in the 50cal birds. The thing with the 152's cannons against bombers is that (and anyone who flew a lot before AH2 will remember this when we got AH2) the nose wavers, unlike the 51 and 47 (magnified by the comparatively pinpoint accurate ballistics), so that it's real easy to spread the cannons too far apart.. Unless you get in real close (and risk more time in the bombers' defensive fire - begging for a rad hit); and there too it's a toss-up: for the 50cal birds, you have to fly pointing at the target for longer compared to the cannons' quicker lethality.
8x.50 is a real chainsaw, and from further out, and the 47's pretty durable.. But then the 47N's no climbing monster. It's a toss-up.
Comparing the 51 and 152.. It's pretty obvious IMO that the 51 is much more user friendly. The only way the 152 appears as the better, more potent fighter is if you're experienced enough to be able to extract that potential from it; even then, the 51D isn't uncompetitive either. That user-friendliness is a more useful virtue to most players. There's enough different flight regimes where either one of the two comes out on top that neither is clearly the better plane. IMO the 8 ENY value is pretty much perfect. The 47N needs 8 or 10. It's just too heavy, the wep lasts too little, the firepower is too restricted by the other attributes.
The 152.. I'm biased, but one objective argument is that the K4 simply can't be 20. Not when the 152's at 5, which is definitely too low.. I think it deserves something like 8 as well.