Dock a point from your health, if they are using red style you will die in one hit, so it doesn't matter.
Now put it into your gun or get a grenade, or two grenades whatever.
Shoot them, honest to god just shoot them and back pedal.
Then when they get close in stab range, press 1 this will bring up your melee then press special arm barge. I would practice this combo until you get it right.
If you got the grenade, save it for when they duck, right click the grenade at them and they are on their back on the ground. Now you can shoot or punch them.
I would find the hotkey that brings up the grenade, and keep your fists equipped.
Practice going back and fourth between fists and the grenade, because they will see it coming if you are just holding the grenade in front of them.
I know you like playing wookies, but if sith spam becomes a problem play a hero, or one of the clone types. It fucking sucks fighting 10 sith and your the only person on your team this isn't a jedi. I know this feel. Because the best way to fight sith/jedi is two people with guns shooting him, and constantly trying to flank him.