Hi athca,
Clearly you have a bright son! You mention difficulties with recall and and written output. Tell us more about these. Is the written output primarily a motor issue (handwriting), or are there other/different issues such as formulation, organization, spelling etc? What about the recall - is this mostly in oral communication (ie word retrieval), or does this extend to other things such as long term memory, ability to remember details etc.
It is hard to get a picture of a student and their strengths and challenges via the WISC alone. It is clear that his reasoning is very solid (VCI and PRI) as is his auditory working memory (WMI). He seems to have a Ferrari brain with a Volkswagon processor (PSI) which can be very stressful and can impair input and output in an academic setting. Extra time, access to technology seem to be very reasonable accommodations. Generally an IEP has instruction in addition to accommodations. Does his IEP include any? I'm thinking perhaps OT, speech and language, maybe previewing of concepts ideas so that he can better formulate his oral and written responses to take advantage of class discussion. How is he with math facts? Does he use a calculator?
What are his strengths and interests? How does he like to learn (reading, discussion, hands on?) Tell us a bit more about your son as a learner and about his school's current approach to his education, and maybe we can chime in with some ideas to reach his strengths and to compensate for his challenges.