Do you have hound's tooth geared up? I don't remember what I used to 3* that node, but I remember it was really hard until I farmed HT, and then it was pretty easy, since he's basically invincible until they can use Thrawn's ultimate. I think I used something like HT, XB and ITF under Thrawn. XB starts with stealth, which means they have to target either ITF or HT. First move for ITF should always be special, so that he will dodge and give you that TM boost. For reinforcements, bring damage dealers that don't taunt. The idea is to keep HT perma-taunted with breach, and quickly kill the other team before Thrawn can use his ultimate. Phantom II, Vader, etc. Scimitar is also nice under Thrawn as a reinforcement since it gives the crit chance boost. Don't forget you can lose 1 ship and still get 3*, so it's OK if ITF dies in the opening volley. Hit hard and fast and you'll be OK.
