You have already fixed the problem of capital letters in Custom enchantments Thx^^

but I do not know if you have corrected the problem that the items with custom IDs are not shinning effects.
It's the same in Vanilla it works but with Spigot dosen't work

If you have not done copy paste the minecraft code.
When it brought into game the system of the enchant custom with ID Custom it worked well.

You can see on the screen that item a id "shinning" and item shines.