Ah, Industry. Even though there's not much on it, that's still my choice of aptitude.
And an interesting choice of Combat-related skills. All of them seem to have thier pros and cons, though you never specificlaly mentioned any cons to them.
Maybe "Ordance Exprt" makes weapons have a slightly slower rate of fire, ~5% maybe, to offset the more damage. Not all skills might have this effect (I used "Ordnance Expert as an example, it seems fine now), just to nerf some of the really good ones.