Please disregard this if you want.

I don't know if you are finding some relief from the itbs but I wanted to share what I do. I had nasty itbs last year. Felt like a hammer in my knee. I went to physical therapy for it, did the foam roller, strengthening exercises, etc. But what helped me the most was a stretch my pt for my foot recommended this fall.
Lay on your back. Legs straight out. Bend one knee and pull it towards your chest and opposite shoulder. Make sure your bottom is flat. You should really feel it in your glutes. Hold for 30 seconds and switch. Repeat a couple of times a day.
I also switched shoes. I had been fitted for shoes but when I lost 50 pounds I stopped pronating and developed a slight suppination. No one could believe I had stopped pronating--I guess that doesn't happen too often. The stability shoes were making the itbs much worse.
Itbs is so awful. I hope you can find something that works for you.