Have you explored the site below? (& her book is often in libraries)
Book - Conquering Carpal Tunnel Syndrome and Other Repetitive Strain Injuries- by
Sharon Butler has very good stretches for all RSI /TOS with info on posture causes and corrections. She has detailed stretching ideas to gently
coax the damaged tissues to release-not to force them.
her website:
www.selfcare4rsi.com