If muscles are in spasms or have triggerpoints , all the stretch " work "will not help..
it will only make muscles react more.

The muscles you mention are often related to thoracic outlet syndrome, what was the cause of your muscle wasting?
our TOS forum link for more info-
http://neurotalk.psychcentral.com/forum24.html

You might benefit from some Gaston or gua shua
https://www.google.com/search?q=gua+...ua+sha&tbm=vid
https://www.google.com/search?q=gua+...ston+technique
https://www.google.com/search?q=gua+...+point+therapy
http://www.selfcare4rsi.com/fascia.html