The Ready State Virtual Mobility Coach is like having a virtual Kelly Starrett in your pocket.
This is a great video that pertains to your issues. Watch how much difference Jill makes in just a couple minutes in regards to her shoulder tightness. I love this mob.
Here is another winner to free up your neck/shoulder junction. If you are new to pulling movements like deadlifts, cleans, and
snatches, your upper traps can become very tight and affect your
shoulders. The lax balls can be pretty harsh so beware. It works wonders though. Kelly had us do this hugging a 45lb bumper at his seminar in May.