I don't want to assume what you are thinking, but so far:
you tried everything with speaker placement and seating position and volumes
room is treated
it's a decent size room
it should produce a soundstage
your layers are either not produced or something "eats" them.
you think it's your room size. I think it's synergy and I assume it's the lack of, between the speakers and the room. (and I hope this will be the lamest, most useless comment you will get today)