Do you think it's possible to do it without Dengar ?
I actually run a zBossk g12, Boba g12, IG, Bane, Greedo g11 (0 pieces) and i still got difficulty. Except the fact that I need to retry in differents cases : r2 start with everything else than basic, Chewie resist on Bane's stun ..
I've try differents way of modding, the best results were with Boba CD/CC, Bane potency, Greddo CD/CC, Bossk Health/protection, IG potency. (all thoose mods are my tops mods so +80 to +150 speed for thoose 5 sets.
My gear level is quite good, but i really think dengar is essential... :(