Could you send me by email to smaugpuppy@gmail.com your savegame please? Or if not possible explain me which decisions are you taking? Might be your romance level is not high enough
I’m getting the same issue as well. I got all the fragments right before the finale but can’t seem to get the perfect endings (no madness). Tried with both Antonio and Elias. Both times Cthulhu gets banished but then comes back and the ending becomes Cthulhu Unleashed
Yesteday I did a test myself with Antonio's route and I got the perfect ending without problem. Could you send your savegame to smaugpuppy@gmail.com so I can check it please?