If you aren’t seeing improvements with what you are working with you haven’t identified the cause of the situation.
Pro Episode # 21 – Pro-User Request Friday: Not Seeing The Change? You Need a Systems Approach.
It may be a mechanics issue vs a mobility issue
Do you have any tenderness? Pec, sub scap, anterior deltoid, bicep?
It may take a little time for you to hold the changes in position.
You are unlearning one thing and relearning another. As with breaking any habit it can take some time.
How many times a day are you working on this?
2-3 times a day. Shorter amount of time between sessions is best. Your body needs the reminder/trigger. As this is worked on you will maintain the positions longer.
Anterior Compartment Smash
Banded Lateral Opener
The 500th Video; Great Sub-Scap Shoulder Smash Drill
Bubo Barbell Pec/Psoas Smash Quicky or What to Do With Those Bent Barbells
Anterior Delt Barbell Smash