Duranzo, can an Ogre be so strong to flap his arms that he can fly? I know the feat is the key to enable, but most flying creatures have consistently strong dexterity scores while strength can vary. I know by RAW or game function it really doesn't matter but to me this doesn't fit orcs or axes for that matter. Now if he were to push off of something since he really doesn't have any capability it would justify strength but right now why would an orc spend this much training to not even be able to move as much as if he took a double move. It isn't that I don't understand battle action and it does enable more actions but charge, pounce.. fairly easy to come by.
Here's the thing: from the description, the PC isn't flapping its wings, they're spinning and using that lift to raise themselves up off the ground. Bird wings require some degree of manual dexterity; to an extent, with all the flaps and rudders and so on, planes do too.
That's now that's going on here though; the character is basically a helicopter. As everyone knows, helicopters don't fly; they beat the air into submission. Hence, strength. ;)
I have a standard disclaimer to any type of homebrew feedback I give: Damage balance is not something I have a good grasp on, and anything I say related to that should be taken with a healthy helping of salt.