Have you seen any of these?
Soft Tissue of Neck
Soft Tissue of the Upper Back
Jill Miller and Your Dys-Supple Neck
Episode 169: Forward Head On Neck Position
Jill Miller has some quick fix videos that address the neck, shoulders, and upper back.
The shoulders and upper back could be impacting the neck.
A link for a free quick fix others are available for a small fee.
Have you looked downstream of the neck for areas that may be impacting the situation?