At first glance maybe just gear up your Rebels to G11. That would help a lot. Are you doing reg or haat? Start working on a good P2 team would help also. Resistance, clones, or driods. I recently finished my Resistance squad. I can pull 3.5m in p2 with that squad and I place top 3 with other squads now usually 5m in damage approx.
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My Rey is decent right now, so I guess that's not too bad considering Pilot is GW so that's about the easiest farm there is.