I've been running:
Zader (L), Thrawn, R2, GK, Wampa. It struggles a bit with the RJT/R2/BB8/OB/GK teams sometimes, but Rex lead solves that problem with the TM gain to outpace them in the long run. Works great against NS, CLS, and any remaining GK/Barriss teams out there and holds as well on defense as my CLS team did if not better as the NS teams tend to avoid it. Thrawn is 268 speed, GK is about 230 speed w/ 100k+ hp/prot, R2 is at 280 speed, Vader is fairly slow rn at 200 speed w/ 60% potency and 216% crit dmg, Wampa is at 223 speed with 216% crit dmg, and has the unique zeta, but not the Healing Immunity on his Roar zeta (That one doesn't seem like it would make a very large impact based on how the matches have been going).
Defense aside, goddamn it's a fun team. There ain't no better feeling than watching Wampa counter attack CLS for 50k or watching his AOE wipe out an entire team of NS in one blow after he's stacked some offense and theres plenty of DOTs on the field. Mods are here: https://swgoh.gg/u/vertigo/collection/