Speaker placement is fundamental to good sound (as is the speakers' dispersion pattern-but we can't change that!). I suggest you try the following: measure room width and place the spkrs at ~45% of that width from the back (i.e. behind them) wall and ~25% of that width from the side wall. Measure from the centre of any unit (say, the woofer). Listen and then fine-tune the sound moving the speakers in very small increments.
Good luck!
Good luck!