I'm in a bit of a rush so can't answer in detail now, but fwiw our ds12 (dysgraphic, + a few other things including an expressive language disorder) has similar scores and discrepancies (his processing speed is a little lower, wm a little higher). How old is your ds?

Our ds has had remediation and accommodations for handwriting and expressive language - I can come back later this weekend and post more info if it would be helpful re the challenges he's had and the type of accommodations he uses now in 7th grade - not sure what age "older" you're looking for input from?

polarbear