For what its worth, You won't be doing anything if you are trying to release your itb with a foam roller by rolling on the itb itself.
It is just a strong as fuark peice of connective tissue that isn't going to change much. There's a vid of somewhere of people hanging a small car from what used to be someone's itb (they were dead of course).
To do anything to your itb your need to work on the muscles that insert into the itb (glute max and tfl)
If you feel like you are twisted, then I wouldn't mind betting you probably are. This is going to hugely affect the way your sij and lumbar spine are being loaded in weight bearing exercise.
Also, is this leg leg difference you have structural or functional? It will definently be causing issues...