Maul lead has worked great for me. Maul has great health regen on His attacks. Savage obviously has a lot of health gain. Nihilus and annihilate gives him a massive health pool. Assassin is usually stealthed so she doesn’t get hit much, and her high damage with 10% life steal is plenty to restore what damage she does take. Sith Trooper can restore protection and even though he doesn’t do a ton of damage he usually has counter which helps restore his health through health steal. Palpatine has a self heal. Sidious heals whenever anyone is defeated.
All of that seems to be plenty when you also factor in all the evasion and the stealth that prevents one target from being focus fired.