I think many people who use this plugin have noticed that the rarity too hard on any settings or some items do not fall at all if you put 3-4 rarity levels (like a fuse in barrels)
This plugin even breaks the standard item drop rarity by default settings, although this is not the case in other plugins.
There is a lot of garbage in my boxes with any settings: I tried to set default settings, I tried to change the rarity 1-3 for each item, the only way out is to remove less rare things, but then only rarer ones will drop out.
I suggest the author to remove the influence of the rarity system at least on standard settings
do only to change the loot table, because otherwise it is impossible to use this plugin