When my IT band issue was more acute, I had sharp stick-a-knife-in-it pain in my knee, where the IT pain usually was, and it was sorta sticking a bit during the run when it happened, as if there was something preventing smooth movement. It was about mile 6 or 7 of an 8 mile run, I think, and if I sorta ran without bending my knee or bending it less, the pain wouldn't occur. I don't know if the problem with a tight IT band may pull something out of whack to cause the more severe pain due to it misaligning something perhaps. I don't know if this is similar to what you're experiencing.