You get a high kill/hour stat by...
Fighting with minimal time to the combat area, e.g. cv fights, base defense.
Flying aircraft with large ammo loads for multiple kill sorties, i.e. 5-6 kills should be no sweat.
I do fly to altitude (usually 14-17K depending))
You will never score high in K/H if you're doing that. It may not be the full explanation, but it's necessary that you not spend so much time climbing just to enter a fight.
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Edit:
Right now you're at 1.7 K/S. You really need to bump that up to raise your K/H stat. For now I would worry about getting more kills/sortie, and forget everything else. Don't worry about deaths, gunnery %... You'll have more fun, get more shooting practice and simply become more lethal.