Chewie Event Difficulty Change

I managed to complete the last tier with : Bossk (Leader w/zeta), Boba, Dengar, IG88, and Bane, all gear 11 with average mods focused on speed. I kept hitting Chewie after every restart and eventually got him down with everyone still standing, from there han and rolo were easy. Just took a lot of restarts, probably about 50. I had literally given up, but went back to it and tried a couple more times and finally got it.