I can give you tips but you won't like them:

- speakers need to come at least a quarter to a third of the way into the room
- sitting location needs to be at least 5 feet from the back wall
- speakers need to be 12 feet apart and 4 feet away from side walls
- sitting location needs to be 12 feet from the speakers

Basically you need a bigger room. Please don't hate me. smile

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