Btchance, I wonder if you've ever had a previous hip or groin injury? I had a really bad groin pull about 5 years ago. My biomechanics never seemed right after that (probably didn't help that i never saw a doc). I'm pretty sure that it healed badly. What you describe about decreased range of motion and general tightness on that side on that side of you hip is the same for me. I never really thought about leg length discrepancy at that time.

I started getting into running over the last year, but have had IT band issues, likely due to my messed up biomechanics. Long story short: I started stretching more about a month ago and managed to re-injure my old adductor injury (simply by over stretching) . It's finally better, but it definitely seems like my injured leg is shorter now, or more likely my pelvis is tilted so it seems like it. I don't really have any advice for you, but I sympathize.