The hunt monsters should be turned into level 50 FATES, the daily hunts are already FATES bosses. Instead of a super long respawn timer, make them spawn on a regular FATES timer based on rank. Pretty much every other major contents have had progressive additions except for FATES anyways.

Or

Maybe just get rid of the hunts all together and make the redeemable reward grand company seal based. I get these monsters are suppose to be special and it should be a reward just finding them, but organized hunt groups has turned something fun into a mission, so the purpose of hunts have already been sabotaged anyways. I feel for its intents and purposes, hunts have been a bust since day 1. They should be fun, but in reality they are usually frustrating and hostile.