Phase 2 for me the best team is one with Phasma as Leader, Poe, Fives and 2 DPS (Rey/QGJ/Leia/GS). Phasma procs extra attacks, is great with TM manipulation and lays down those all-important debuffs against the Rancor (Speed Down and Defense Down). Poe is awesome for drawing fire with his taunt, the occasional lucky Expose and the VERY important Offense Down, which he can manage once the Rancor has been painted by Phasma. Between Phasma and Poe locking down the Rancor (somewhat) and the others racking up damage, this team will definitely shine.
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Can also swap QGJ with Omega basic for Rex.
Don't laugh, try it.
Against Rancor, Phasma/Aayla/GS/Rey/Han