I'm so late to reply with thanks. I got swamped with work, and then forgot to follow up.
I appreciate the thoughts here, and I especially love aeh's enthusiasm about figuring out these anomalies in the testing data. I always find it so frustrating when the people doing his testing don't think that these gaps are indicative of anything. And I wouldn't have even batted an eyelash at the discrepancy between the FSIQ and the higher math scores, but aeh does. :-)