Thrawn Event 7* too hard - impossible to clear with reasonable gear and mods!!

Omega uniques help a lot. And as one commentor said you want zeb every where.
I got really lucky. But I cleared stormtrooper's taunt and did my best to daze, stun, and stagger the dts. Once you get through the purple protection they go down faster. Then go after stormtrooper. Then the healers. Hopefully by then you have Hera Ezra and zeb left. And take Dow. The Grand Admiral. Also rng plays a huge part- so keep trying.