@BzmR94 G8 and G7 is doable if you have good mods. I have Ezra, Hera and Chopper at G8 and Zeb, Kanan at G7. All are level 85 and with their uniques omegad.
After about 50 attempts with 'average' mods I shifted all my best mods on to them (so they had between +60 and +110 speed and were loaded with protection).
I managed to win first time with my best mods - but it was close. It came down to Hera, Kanan and Chopper against Thrawn with full health/prot. I had to carefully use the back-up plan and taunts and manage the fractures but I took him down in the end.
So G8 (and even G7) is certainly possible with good mods and good RNG.