Hey George. Does your sons lower PSI show itself in any practical ways? Is he particularly strong in any academic areas vs others?
I think high WMI allows him to ponder a whole lot of stuff in his head at once, and so he can be really thorough... but he is noticeably slower than other kids at writing and at computational math. His biggest issue now is the latter, with his slow computational skills often masking his high math reasoning abilities. It will be interesting to see how that unfolds as he gets a bit older.
Of course, if your DS is 9, you've likely already seen how his PSI likely affects his approach to things.