Its my understanding that winging is either due to muscle imbalance or injury to the long thoracic nerve. For muscle imbalance-- do scapular stabilization exercises. A good PT should be able to give you exercises for it. To test for injury to the nerve, EMG studies are usually used.

Regarding scar tissue - its also my understanding that scar tissue continues to form/solidify for the first 18 months. You might try ART (Active Release Technique) to break up of the scar tissue. Like Graston, a chiropractor will usually do this for/with you.

Rick Mehafy - is good chiro in the bay area (redwood city) that does alot of myofascial release type work.

thanks for posting -- and good luck with your continuing recovery....