So I have a few huge baddies, and my solution for this had been having smaller baddies with them more or less. So a big powerful boss, but he has like 5 lower health shield drones on him that have their own Moves and Abilities. I don't know Monster Hunter super well, but it feels like a thing where you could take a similair approach in having modular bits that players could focus down that might award them a drop, and might make the big bad easier, at the expense of not getting to chip away at his health that turn.