Thank you polarbear and Grinity! I forgot how to do those cool quote boxes, so I am just going to respond to each of your posts here.

polarbear, I actually do not think he has disgraphia. I think the handwriting issues are just part of the delayed fine motor skill level that he is working on (he also has been working on shoe tying, buttoning/zipping pants, etc.). So hopefully with the therapy we can get him caught up eventually. As I think about it more, I think the perfectionism is playing a big role in it. I also kind of wonder if it is a way of entertaining himself to avoid boredom. His writing is sometimes so perfect it is almost like he is creating a work of art. As Grinity says, I guess I should be happy that this is how he chooses to alleviate his boredom. lol It just seems like he is burning alot of time and energy on this that could be put to some better use.
Grinity, great idea to work on the keyboarding. That would answer some of my concerns about how this slow handwriting speed might be hindering him, which is that he might not write something or skip some elements of something he wants to write because the effort is just is too much. Or, as the therapist pointed out, someday he is going to have to take notes on teacher's lectures and he needs to be able to keep up.
You make a good point, too, Grinity, that I shouldn't necessarily expect the teacher to change, but perhaps focus more on helping him understand that the expectations may be different in different situations. And I also don't want to alienate the teacher because she has been great with him overall, especially given some of his sensory seeking behaviors.
Big thanks to you all for your insights!