Real experience - Balanced or Unbalanced between Luxman Pre & Power Amps

Hi Folks, 

After having spent quite a bit of time testing both balanced and unbalanced cables between a luxman c10x preamp and m10x power amp.  I'm not noticing any difference.  

My balanced cable is from blue jeans and interconnect is a QED ref 40.  

Does anyone have any experience with these components, if so what has your experience been and what are you using between them?