Good to hear you are finding some improvement.
Nice to hear you found changing to flat shoes for squatting has helped.

Couple others to check out
Thursday, May 31st, 2018 – Improve IT Band Pain
Go to the Daily Maintenance scroll down to the 30:00 San Dimas.
Have you voodoo banded musculature around the IT Band?
Stay consistent for a week or so and see how it is. It didn’t get here in a day or two so it might take a few to resolve.