Have you thought about pedal extenders/knee savers? I used to have chronic knee cap pain, I also have ITBS. The pedal extenders solved my general knee problems, stretching has been great for the ITBS.
I did learn (the hard way) to put the extender only on the side with the painful knee.
http://www.bikescor.com/product/knee.htm

These are supposed to be great for women, people with wide hips, nock knees... anyone with a Q greater than their pedal distance.

Sue