I love the websites you posted esp. the easyvigour- very easy instructions! I love this! learning all the time...and I don't even have an ITB problem/imbalance. ( But I know people who do)!
Robyn: I can only say I second what Wahine suggested: I often see this sort of problem with people who have a kinetic chain problem- ie muscle imbalance + or - a pelvis rotation. My first choice would be a manual therapy trained physio to help you through this- some of my patients have also had some luck with ART ( active release therapy) never having experienced it I can only report what people tell me about it- "it works but it frigging hurts".
A manual therapist can almost certainly help hopefully with little pain.
Good luck- I hope you feel better soon