I'm not a testing expert, but the one thing I would have guessed would be that math is your ds' area of strength
Really those are strong scores all around! And it sounds like your ds is doing great, happy and doing well at school. I wouldn't stress about the scatter in the scores as long as things are going well - keep giving him opportunities to soar!
polarbear
ps - one thing you might want to do is look at subtest scores - do they look consistent under Verbal and consistent under Non Verbal, or is there a wide range of scatter in the subtest scores under each category? If there is scatter... it might be interesting to know where. Also, if one particular subtest score is pulling down the Verbal score, and without it it would be more inline with the Non Verbal, I would wonder if the score was valid (was your ds tired during the test etc).