I would borrow a good pair of electrostats or two of those modern horn speakers and start experimenting again. After all, width and debth of soundstage isn't all. There is dynamics from pppp to ffff and the rendering of the right timbre of instruments. Try solo instruments, piano, violin, cello and voices- sopranos are especially good at full tilt boogie - and see if you don't notice more of a difference.
Happy listening!
Happy listening!