I fixed the tightness on top of the nose on mine. It was actually the elastic band that was causing the pressure on the nose. So I bent the mask to move the pressure on the cheeks. Here's a few pictures... as you know, I have a nose of pretty epic proportions, so you might not have to bend your's as much. It's a bit hard to see on the pics, but check the first one, it shows how I bent the mask to elongate the nose area and move the pressure away from the nose.
http://tinypic.com/view.php?pic=211m1r8&s=4
http://tinypic.com/view.php?pic=24l6hch&s=4
http://tinypic.com/view.php?pic=2hgbyaa&s=4