I have a lot of experience treating/needling dystonia from cervical dystonia to spasmodic torticollis. As we know the main issue is central (basal ganglia most likely) and secondary peripheral effects. Follow the nerve so to speak and address the main areas effected. So commonly the SCM (C23/XI) is involved in our CD patients so address all access points as we describe in the course for those areas and do not forget to treat the opposite side as again it central with peripheral effects. What you will begin to see if the reduction of the peripheral tone that begins to have carry over, which allows the patients to function at a higher level in between sessions. You will also be able to spread out the sessions once you have them under control. They will, of course, never be fixed but in between sessions their function can significantly increase and discomfort can reduce.
Hope that helps