I'm trying to get it to work as a helmet.
thats why its in the amulet slot to begin with.... its a modders workaround
Putting it in the head or hair slot will either disable rendering of the whole head. or disable the hair and ears.
you start to have drawbacks if you effectively want to add head, ears, eyes, or hair into the tiara nif itself, in an atempt to circumvent the removal of the hair/head. It's bloody annoying if you ask me.