That's a respectable geometry. Given how close the speakers are to the side walls, you won't have a soundstage outside of speaker boundaries but you should have a nice soundstage within. It should also be tall with your 10 foot ceilings.

In 2.1, you should have no problem getting a wall of sound. Is the speaker polarity correct at the receiver and speakers? Also try with and without sub. If your sub is not dialed in correctly, it can mess up the imaging. Finally, try not toeing in which may widen the soundstage.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated