I installed the main file first of course, from there things may have been out of order. For example, rather then installing XPMS Extended for Elin 2 next, I think I actually installed it last. If so, my side issue. Other then that, I tried to keep things simple. I installed the hair and that's it. Three files. Main file, XPMS Elin, and Elin Hair Pack. That's all. (I have a bad memory, so I try not to install a bunch at once, odds are if given installation orders, I'll forget them... I had all the requirements installed already, everything's up to date, too)
Problem was fixed when I reinstalled. I personally put the Tera Elin folder in the meshes/actors folder and installed everything else by NMM in order given. As I said, papyrus complaints were gone, everything ran smooth. I could even load up the game later.