Welcome! My apologies for the delay; I've been on limited internet.
Your DC's cognitive profile does have some consistencies suggesting slow processing speed in general, possibly specifically fine-motor speed, and I do agree with following up with an OT. The two measures of working memory are average, which most likely is an unremarkable finding (unless you have IRL data that would suggest otherwise). While some individuals with above average cognition have working memory to match, many do not.
At the moment, the two screening measures of academic achievement are consistent with best estimates of his cognition, but are limited in scope. What caused you to wonder about underachievement?
