Duke, millercarbon, and erik have some valid points. Square rooms are bad particularly for bass, directional speakers are the best way of avoiding room interaction and a large percentage of the way a system sounds is due to the room.
So how do we integrate all these factors. Will going to VIII's solve anything? Not really. With more bass it might even make the situation worse. This is a room for small Maggies, ESLs and some absorption on the front wall behind the speakers. Horns would also work like Klipsch Heresys or Cornwalls. Down the line you could add four small subs like Duke's system. I really like Sonus Faber but dynamic speakers like that need more room to breath. Right now you are being assaulted by early reflections from all sides.
So how do we integrate all these factors. Will going to VIII's solve anything? Not really. With more bass it might even make the situation worse. This is a room for small Maggies, ESLs and some absorption on the front wall behind the speakers. Horns would also work like Klipsch Heresys or Cornwalls. Down the line you could add four small subs like Duke's system. I really like Sonus Faber but dynamic speakers like that need more room to breath. Right now you are being assaulted by early reflections from all sides.