I have no experience with the Mite, but judging by this measurement which I found from a Mite owner, it's easy to see what would be causing the fatigue - the top end is tipped up significantly, probably intentionally to give the sensation of more air and detail.
http://harmonicsreview.files.wordpress.com/2010/02/totem-mite-fr.png
http://harmonicsreview.files.wordpress.com/2010/02/totem-mite-fr.png