Welcome
Have you checked out the TRS Glossary for terminology?
Great to hear you are seeing improvements in mobility in many places.

From the virtual mobility coach you can search the archive for shoulder internal/external rotation, shoulder flexion and have many options.
Daily Maintenance scroll to the 20:00 section Maya or 30:00 Lombardi
In the hang archetype (second position you mentioned) goal is to have your hand inline with your hip without your shoulder coming off the ground. This is roughly 70 degrees.