Is the winged scapula possibly due to nerve compression? Have you seen an orthopedic shoulder specialist? Maybe he/she can tell you exactly which muscle is not functioning properly and look into the nerve that supplies it (i.e. if it's the serratus anterior muslce, then maybe there's compression to the long thoracic nerve). Unfortunately, it seems that the human body likes to compensate and then we have to deal with a domino effect. Please keep us updated. All the best.