When you sit down with your School Person, consider asking about a skip of K, and going right into 1st grade. Get someone from the daylong preschool to write a letter discribing the program - including it's length and academic content, and his reaction to it, including his good behavior. School are really into social skills! You can alway slip him back to K, or repeat 1 if it doesn't work out, or if his actual testing comes back not supporting the gradeskip (unlikely)
Try saying 30 times, "He's just old for his age." with a little shrug and smile.
It would be ideal if you could "sit in" on a K, and a 1st and a 2nd grade classroom. You could
a- see if you can picture your child in that setting
b- start snooping for who are the teachers who could appreciate and lead him.
What is going on with the emotional issues. Did they take place at his preschool? Escalating emotional issues in a preschool, or early elementary context is so commonplace, that we don't usually even talk about them on the 2E page - it's often just a normal side effect of a certian level of giftedness in an unaccomidated classroom! But sometime times there sure is more.
BTW - schools that are "modest" are usually aware of this and MORE accomidating with grade skips and subject accelerations than schools that "have a good reputation." go in with an open mind, ok?
Love and More Love,
Trinity