You would be better off upgrading to Axiom Qs4 or Qs8 quadpolar surrounds to replace your dipoles. If you mount them to the sides, they will reflect off the back wall and give you a 7.1 simulation.

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85