I think a may be time to rebuild a little. You have a solid number of toons around g7 g8. I'd run boba as your lead. Phasma and GS will work very well under him. They're your highest geared so keep them in.
Poe'a not a bad choice while you're gearing up Sun Fac but SF's dispel will really help. Or run a double taunt team.
I'm not really a fan of healers in the arena but if it works for you leave lumi for the time being.
I love Sid on Vader/ Maul squads but he doesn't have much synergy with your squad. 88 would work well under boba.
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https://swgoh.gg/u/nightmare4/collection/ (that's better than google drive links)
Or get TFP due to his foresight thing and go more dark side
Poe'a not a bad choice while you're gearing up Sun Fac but SF's dispel will really help. Or run a double taunt team.
I'm not really a fan of healers in the arena but if it works for you leave lumi for the time being.
I love Sid on Vader/ Maul squads but he doesn't have much synergy with your squad. 88 would work well under boba.