The Hunter's Jade co-op quests only being playable once per day was a huge let down. The second best way to farm Jade's is to do several trials in a row and most players are going to end up doing this at some point.
Furthermore, most players will realize that the optimal trial hunt to do this on will be against the monster they're able to slay the quickest. This gets boring very, very quickly.
The simple solution is to have a rotating marker on trial quests that moves to random other trial quests every time a quest ends or a free hunt in the overworld is completed. This way Jade farming players will get to do something different every hunt.
Also, the side-goals on trial quests should award Jades on repeat completions, so players have additional things to work towards besides just killing monsters the fastest.