You have to go into the fourth phase and kill the death Troopers first followed by the Stormtrooper and the healers and then thrawn last. I had a lot of Speed on hera and Ezra. Crit damage and stacked offense on Ezra too.
You're definitely gonna want to spend some credits and level them up. I did it with the same gear level as you but all level 85. Every little bit helps. Also, you'll want to follow @Analglaucoma24's kill order above ^
The field of battle is like the mongoose. Slow to joviality, but thirsty for morning sunshine.
-Sun Tzu
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-Sun Tzu