What’s your roster?
great roster for that quest! try domino or nightcrawler for hulk. they crit a lot. you could ramp up morningstar for maestro too. bring hyperion and quake I'd say only if you know how to use her, if not Gulk should be goodwith your roster it should not be a problem. practice skill on the arenas and probably do RoL attempts just to master dexterity and parry
When I get stuck in content I just back out and do exploring, rank up my champions, save boost and potions and give it a go again later.But my problem were my skills though and by doing exploring I got much better with parry, that helped me more than stronger champions.