As for the perfectionism...Have you considered assigning him to make mistakes? A psych affiliated with SENG spoke to our GT parent group, and he recommended having the teacher assign a perfectionist child to get the lowest grade possible. The goal was to get an F! (As a slowly reforming perfectionist, I found myself VERY uncomfortable with this notion, even as an adult, which told me that it's probably a BRILLIANT idea! It confronts the issue head-on.)
Most perfectionist GT kids can't get below an average score, no matter how hard they try, and the exercise helps them to see that they don't have to make themselves crazy to be perfect.
Your child may be too young for this full-on experiment, but maybe a modified version?
Just another thought...
