That room and the setup has lots of problems -- sloped ceiling, speakers too close to the back wall, open fireplace in between the speakers, reflective surfaces (windows, mirrors and glass picture frames) everywhere, furniture in the way, etc. Speakers placed on the long wall probably doesn't help in this situation, either.
Not trying to piss on your parade, but you're gonna have massive issues with this room no matter what you attempt to do. It's time to pull rank and demand a man cave.