SPD symtoms in the older child/teenager?

I am the mother of an 11 yr old boy who was diagnosed with SPD when he was almost 6. He had intensive OT intervention and progressed fantastically. His academic abilities are very good but his concentration and focus can be poor. His gross motor skills are hugely improved so riding a bike, swimming, running and some team sports have been conquered. His fine motor skills including writing, however, are poor. His social skills were not good when he was younger but he has improved there also although he wouldn't have a huge circle of friends. He is outgoing, confident and generally positive.

However, 10 months ago he started developing twitches or habits (something he had done before but which didn't stand out too much) that became quite pronounced - shoulder shrugging, smelling his fingers, eye blinking, repeated touching of doors when he would go by etc. They would come and go somewhat but the shoulder shrugging has remained and sometimes can be very frequent. It also upsets him as he has been called names by some of the kids in school and he is very aware of it himself.

I am anxious to find out if these habits are a feature of SPD in an older/pre-puberty child or whether they are something entirely unrelated (OCD/ Tourettes?). I am currently visiting a Craniosacrel therapist who advocates Listening therapy which I will be starting with my son over the next few weeks in conjunction with a lot of his previous OT exercises etc. But any information that I can get which will perhaps explain these habits and more importantly help him to deal/manage them would be great. He is entering his last year in primary school and I am very anxious to sort out his 'problems' before he moves onto secondary school, and a whole new set of teachers and classmates, next year. I would be grateful for any feedback/experiences/information that might be out there.