Possible to 7* Thrawn this time around?

Your gear level looks fine. It will just take many attempts and luck with rng. I had lvl 85, 7 star, gear 8, uniques omegaed on my phoenix characters (kanan, ezra, hera, chopper, zeb). I had 181 speed on ezra, 120 on kanan, and 150-160 on the rest just so you know what you would want to aim for. Your gear should be more than enough. Just make sure you dispel the deathtroopers and use hera's res ability and taunts wisely. Don't taunt unless you have no other choice and I'd use chopper's first because of the evasion bonus. My kill order was deathtroopers, stormtrooper, healers, thrawn.