Sorry if I'm breaking your dreams boys, and correct me if I'm wrong
But the level (xp) and the unique drop rate level range is a whole other story
Unless webzen changed the values it stays the same : Every mob wich is 1-2 lvls higher or lower then the unique drops the unique
Example : Blode ring lvl 53 , lvl 51 euriale soldiers, lvl 52 walaya bodyguards, lvl 53 duriven, lvl 55 robatoms
Xp is something you get from every mob, but webzen must place the unique ring/neck in the drop thing of a mob, atleast that is how i think
So yes you can drop shuta when YOU are lvl 31, but you were able before the update aswell