I did it with Han g11 and rest g8. Try gearing up r2 to g8 and then follow these:
1. Give them the best mods you have.
2. Change Han's tenacity and critical damage mods to additional health/defense.
3. In first stage do smoke screen at r2 so you will save Han's protection.
4. Always try to stun with r2 target with the higest turn meter. Barely use burning, only when one of them is already very low.
5. In third stage taunt with Han (don't taunt in other stages). This will give you huge turn meter advantage. Then either stun with r2 or give smoke screen on Han to give him Forsight (need omega).
6. Use Leia Stealth when possible (but not when you are about to move to other phaze).