i know people hate to hear it, however if you do your physical therapy exercises for your shoulder it will improve.
i speak from experience,I've had both shoulders done in the last three years and dont have a problem pulling my bows. not my wheelie bow @65 or my long bow @ 55.
my next self bow is going to be a 55lber,my next laminated bow is going to be 60,so just remember exercises and work your way up to what you want to be able to pull.
you'll get there.
peace,
Tim