I've seen one bike fitter state that a lot of leg length discrepancies that he sees are just people that got into a habit of holding their pelvis a certain way. Particularly when they get on the saddle. And that with physical therapy or just awareness of how they sit, it can be improved.

Even riders without leg length discrepancies use different shims on different feet. So if it works for you then great. I'm not seeing that you are complaining of any pain. So are you just hunting a cure for nothing?