(Wow that is an egregiously terribly modded GMY, what a colossal waste of mod slicing materials)
To the OP, there are generally 2 mindsets for GMY, but they do both boil down to offense and speed.
First:
He has an extremely high base speed, so if you are planning on using him in a team build where you expect to fight a lot of debuff heavy teams (primarily Sith or Sith Empire in mind) the goal is to build him as fast as possible (with whatever offense you can squeeze in), so that you can go before the opposing team and spread Tenacity Up to your team to avoid the debuffs and let your team get an early advantage.
Second: (more general purpose)
He hits extremely hard, and has a huge amount of Turn Meter gain built into his basic, so if you are able to pair him with a lot of assist calling allies (JKR, Jolee, Shaak Ti, Hoda, etc.) he doesn’t need as much speed. There you want to mod him as Offense heavy as you can (and a Crit Chance set with a crit damage triangle can certainly have points made for them in this build), flavor with offense, crit chance, and speed secondaries as you can.
Hope that helps.