Need to rule out possible nerve related causes.

The levator scapulae elevates the Scapula.
Trap (middle part), Rhomboid major and minor work with this muscle.
Are you addressing these?
Muscles which work in opposition to this muscle Latissimus dorsi, Pectoralis major and minor, Serratus anterior, Subclavius, Trapezius (lower part).
Are you addressing these?

All can be impacting the situation.