OMG, hello twin! I have scoliosis, too, and I'm positive that's a contributing factor - it's my "longer" leg that had ITBS and it's that leg that A. was always on the down slope of the road, and B. tends to overpronate in an effort to ease the transition to my "shorter" right leg. I've found that the strengthening exercises have helped a lot and have definitely altered my pronation: I still roll in at the very end of my stride when walking, but not during my run intervals. I wound up in low- (bot not zero-) drop shoes with a little extra arch support, but no full stability. I alternate between Brooks PureFlow with better arch-supporting insoles and Brooks PureCadence with the insoles that came with them. Both seem to be good and I haven't yet been able to pick a favorite to wear for the race! I also read somewhere about taking good ol' white athletic tape (though I'd think duct tape would be good, too) and rolling it flat around a couple fingers, over and over until its thickness is about the same as the dip in your hips from the scoliosis. Stick that under the insole in the heel of your "shorter" leg's shoe. Because it's in the heel, it doesn't help when I'm running, but it's made a difference when I walk - I definitely don't overpronate as much (maybe not at all) on the left, which seems to keep the ITBS at bay. Worth a try!
