Grinity- good questions! I responded before I saw your post. Actually, he is careful in his approach to work. He doesn't get overly anxious too often, but there is a sense of "I don't want to jump into this until I know I can do it right" that sometimes causes him to move at a slower pace. So that makes sense to me.
He's pretty physically coordinated (rides a bike well, swims, etc...) and other than disliking writing he isn't really facing any true problems with fine motor. So I think for now we will take a break from worry.
Thanks again!