Elements of Darkness drop at an incredibly annoying rate. I have thousands and thousands of them from doing regular gameplay.Loving the mod so far, but the elements clog up the inventory space too much. I found myself just storing some then use auto trash mod to just trash every element. They have too few uses and some of them becomes obsolete pretty early. For example, bewitched gem hat and robe combined requires 2000 element of darkness. By the time player collects 2k element of darkness they are likely already to have access to better gears. I'd say 400 would be fair.
Also elements have only 99 max stack with Fargo's mutant mod. Having maxstackplus somewhat counters it as it forces 9999 max stack size.
Personally, it seems that all the extra elements just complicate the loot pools and fill up the inventory needlessly fast. The above poster is 100% spot on.