Let's also not forget that the aircraft you fly has a huge effect on k/h. The stat favors aircraft with big gas tanks and plenty of ammo. When I fly the 109G-6 I almost always have to rtb because of fuel before I can expend all of the 200 cannon rounds.
Still, it seems no one is willing to disagree with me that 5 kd, 1 ks, and e.g. 2 kh is more effective than 1 kd, 1 ks and 5 kh, and this example contradicts the agreed upon formula.
The 109K-4 is a very difficult aircraft to have a high k/h with. puujiiko, one of those crazy fins who flies almost nothing but the 109K-4, has a k/h of 8 with 172 kills, and that's about as effective as you can be in it.