Currently, the amount of damage dealt to an A or S rank hunt determines how much they're rewarded. As a result, people are frantic to deal as much damage as possible as soon as a hunt is pulled. This should be changed so that, as long as you participate in a hunt at all, you get fully rewarded.

You can't stop people from pulling hunts early, but you can remove the incentive for people to follow up on early pulls. If people don't have to worry about not getting full credit, they won't burn down the hunt at the absurd pace that they do now.