FWIW I have them all G12 and used to run them in arena. I think they are still not arena worthy after preliminary testing with an undergeared C3PO. The problem for me is, that you still can't land debuffs on Jedi and Sith will still obliterate you without the Jedi tenacity.
That being said, I'd love to be wrong and will continue testing. So far imho the best combo is swapping elder out. So that would be Chirpa (L), Logray, Wicket, Paploo, C3PO.
You definitely need Chirpa for the lead and Wicket for the dmg. After that Paploo is just an awesome tank and Logray in combination with C3PO is debuff galore... I guess the only one I would consider swapping would be Logray for Elder only for the cleanse vs Sith.
In the end I see this team doing well in STR P2, TB/TW etc., not really in arena...