So far as I know, Advanced Skill Mod 9s are not craftable. They can only be ripped from gear that has it already.
Here is the recipe for Advanced Skill Mod 8
And the one for Advanced Skill Mod 10
Craftable armoring recipes update every 2 levels, but craftable mods update every 4 levels. Enhancements (Artifice) update every 4 levels as well, alternating with the mods.
So it would go something like:
Skill Armoring 8
Skill Mod 8
Skill Armoring 9
Skill Armoring 10
Skill Mod 10
The in-between gear (e.g. Skill Mod 9) is obtained from mission rewards, commendation vendors and rare drops.