I didn't want to deal with moving over arena mods so tried it a few times with all junk mods. Failed a few times so upped Chopper's and Ezra's speed but don't think I needed it in the end. After, I noticed 3 mod slots were actually empty. Zeb surprisingly was the super star, besides Ezra's dps.
Hera - G8 +23 speed
Ezra - G10 +63 CD set
Chopper -G8 +83 speed set
Zeb - G7 +28 (added potency cross)
Kanan - G7, +11, lvl 83
-As someone else mentioned, kill DT first, thrawn last
-Make sure Thrawn fractures worthless Kanan or Chopper (preferred)
-Save all dispells for taunt
-Key was using zeb's daze/stun esp on the DT using Hera's and Ezra's assist. Try to keep DTs from going as much as possible. Ignore everything else until they are down. Do your best to keep everyone alive.
After the first round or two, probably 4 of them were dazed, 2 were stunned on average. Once I got the rhythm going it was rather easy and only Kanan died but had Hera's rez so ended with all 5 standing, almost full health.
You can auto rounds 1-2 with nearly full health, do manual on round 3 so specials are reset.