Kriston, if you had a normal child then you might want to plan your schooling in more details, just so you'd know if he was falling behind in any area. Falling behind in any area does not sound like it will be an issue for your son. And you have his ITBS scores in hand to reassure you of that!

Keep on having fun digging deeper into subjects that interest him, and get creative to develop them into unit studies that incorporate related subjects, you'll keep on doing fine!