After this latest hotfix, supposedly if people are ganging up in one island, it'll make it harder/slower to spawn the tracks for S ranks (NMs)

What I have been told is that each party should pick an island, kill mobs there till you see the " you sense a foul presence right on top of you " and then look for the tracks.
/shout the location to other groups so they can help zerging the S rank mob, and if you hear a shout about tracks another group found, go there for a gold chest.

Got 8 gold chests this way in hard mode last time I went there.