Fist post here. Sorry if I missed something in this...

Eldritch_Abomination -> Monster

Seems to be mostly used for Double_(Skullgirls) and Cthulhu_Mythos. I think the monster tag is sufficient enough for describing something as a horrific creature. If not, perhaps consider Monster + Creepy to add the effect?

Probably fine to just edit them manually and do as you said. Maybe add some of them to pool #339 if they fit.