We are in Australia where we don't have gifted schools and we are in the Private system. Our school will not acknowedge that DS has a problem because his scores are in the "normal" range and therefore is reluctant to do anything. They are focusing on his behaviour.
My son's working memory is pretty good, but his processing speed is below your son's and his other scores are in the same ballpark, and yes - this is a tough road for these kids.
In the US, the Private Schools tend to be more 'product orriented' than the public schools, so it's worked best to be in 'top level' classes, one year ahead, in the public schools where the expectations aren't: 25 page papers written over a 3 month period, several in different subjects at the same time. I found the work that they were doing just as 'advanced' and 'interesting' at the public school, they just weren't expecting the same level of demonstrating the knowledge: Perfect for my son right now!
When we switched over to the public school, at our first meeting with the teachers, I asked, worried: 'How is he with bringing a pencil to class? Last year (at the private school) they were very very concerned and we had many meeting about this issue?'
I was so happy when they laughed and said: 'None of our students bring their pencils everyday - that's normal 13 year old behavior.'
So - if you can find a correctable 'underlying' problem that is bringing the WM and Processing speed scores down, but all means find it. But if he is just a kid with average WM and PS and wicked smart verbally, then he is going to have a very difficult time in school unless they bump him up and give him the support (note takers, electronic keyboard, electronic pen/recorder, extra time on tests, extra help with organizing his homework time, perhaps less busywork?)or he goes to a program for 'creative' kids or 'late bloomers.' Is homeschooling an option? My guess is that if he finds ANY passion, and runs with it, he will find adult happiness.
Love and More Love,
Grinity