Have you had a coach or anyone take a look at this?

Have you addressed pec and front of the shoulder tightness?
Contributing factors to your right shoulder hunching over.
It gets pull forward again because the cause isn’t being addressed.

Do you have access to someone who does soft tissue work?
HawkGrips on the front of your shoulder, under the pec, collar bone, scap is a start to addressing the situation.

Create an awareness of your upper body sitting/standing position. It all contributes to the situation.
Correct these positions.