I'm finally free!!
I was diagnosed about 1.5 years ago, had the condition for maybe 2 months before that. Long story short: I haven't been doing my stretches or exercise as much as I should, I do it sporadically, but two days ago I stood up to go to bed and stretched upwards with my arms, and stretched and stretched... and realized I was at full extension with my bad shoulder for the 1st time!!
I still feel some mild stiffness, but have full range of motion without pain and am going to ramp up my exercise routine very carefully!! There is hope!