Have you tried PLII Music and eliminated the Centre channel altogether?
(If you just set the centre image to its Max, the centre channel disappears and your front L&R handle the phantom centre etc.)
Works for me!
So many CDs pan out brilliantly this way! Try things with lots of out of phase info like Stevie Wonder's "Songs In The Key Of Life", you'll be amazed at the pseudo surround effect!
Thanks for the tip I'll try that for sure!