I use Dr, bastilla, hk, thrawn, and gmy against malak teams. I know no pretaunting tank but my dr is pretty fast so i put fear on opponents first. There are only a few teams with faster drs and i go around them. Dr is the fastest. Then thrawn. Pass the turn to gmy put tenacity up on every one. Then fracture sith trooper to not deal with him. The use bastilla to put fear on malak and go to town. Works pretty well.
Before i put gmy in, i was using shore trooper for a pretaunting tank. In my opinion if you already aren't going full soth empire, shore is a better option. You get the pretaunt of sith trooper but shore is tankier due to not having ferocity and he also heals. It's not like sith trooper does much of your dmg anyway.