Hi there, love the mod!

It looks like Curious Elytra (i.e Caelus) directly conflicts with your elytra implementation.
I'm finding that it's impossible to use the Enderite Elytra Chestplate with it installed.

Obviously that's not an easy fix (since I'm guessing you don't want a dependency on Caelus!),
but I thought I'd bring it to your attention in case you can add conditional compatibility...
it's an either/or scenario at the moment in terms of elytra mods, which is a shame!