My fix for this Hunts would be that they work like Levequests do. This way only people in the group who activated it can do it so no more "OMG Ninja pull" and such.
A hunts costs certain amount and S hunts costs more and you are allowed to hunt x amounts of each per week.

This way hunts could be more tailored for a certain sized group, A hunts for small party and S hunts for Full Party. The hunts could feel like real mini bosses, and if your party dies, you will have to start a new hunt. This way the hunts would feel more dangerous and exciting, well, in my opinion atleast.