Do you (or did you ever) have a 'control' song that you calibrate your ears to before mixing? Any particularly well-produced song with your idea of a well balanced freq spectrum and wide dynamic range
I use 'Splitting An Atom' - one of my own tracks from the Blumenkraft album. I always use that one because I know it well and it has well defined bottom, middle and top.
Also 'Breathe' by The Prodigy.