I've defeated almost every difficult comp with droids for more information on how to beat most everything with droids join the droid disord: https://discord.gg/Q56ByBBMeV
My favorite recently is the 10 second JKL comp vaporizer.
I'm not as much of a forum regular as I once was so I would direct questions expected to be answered in a timely fashion to one of the aforementioned discord servers.
I'm fairly certain there's a combination of 8 or 9 characters that are droidcentric, legendary at best that can defeat any composition, and with proper b team subbing can likely be split into 2 teams that will take down 2 big challenges.
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Just beat an entire reliced ultimate Sith Eternal Emperor team with 3pac's AoE less than 30 seconds into the match.