Better as betterloot?

Hi,

I don't really know how well BetterLoot works these days but yes, rarity, or, rather probability, works properly.
It's a two tier system so item categories have probabilities, then the items within have probabilities.

Every time an item is created for some loottable a category is chosen first, then an item is chosen from within.

Takes a little bit of getting used to, for some, but it's simple enough and consistent, once you get going.