The other issue your question raises is how much and what kind of help is necessary for your son. Is he getting one hour a week at the learning center because that's all he needs, that's all they offer, or that's all you can afford? What does the clinic say about how much to expect from support for one hour a week? If you and your son feel he's doing "baby work," then you should ask the people at the center to explain why they are teaching what they are teaching. You should also ask them if they are in touch with the teachers at school and if the work they are both doing is compatible. It would be a shame if your son were involved in two different reading programs that weren't reinforcing each other.
It sounds as if your son is a critical consumer, and this is great! His motivation should increase if he is made more of an active participant in his own learning. After showing him the results of testing that identify his reading strengths and weaknesses, teachers should ask him what skills he'd like to work on. If he chooses something that's not appropriate, then teaching staff need to help him understand the reasons for learning certain skills in a certain sequence. Your son's perception of the value of the help he's getting is very important. His skill development should be closely monitored and he should be given frequent feedback about his progress in reading. Ask him if he agrees with me. If not, have him write back and tell me why.