Its all entirely RNG for boss loot and posters after a hunt, full parties and tarokka cards do seem to increase the rate but even then its still all RNG. Also be wary of random hunt groups and not seeing loot, the leader may have changed threshold and loot receive from rolling to leader decides.
@michela123 since your original post it has been changed, if it even was an issue as I hadnt noticed one. I main a SW with the orcus set and it procs Baphomet's Might all the time regardless of the skill used, as the set bonus increases your damage up to 20% determined by the difference in HP between you and your target,…