Chris,
I don't know if I would classify it under over-excitabilities but more a control factor. If they lose control than the over-excitabilities kicks in. Being a perfectionist: for me it is this need to always be in control. I have to laugh about the art comments especially Kriston's DS b/c I am an artist and it is such an odd happenings with being a perfectionist and not being a 'realist' artist. Even when my art becomes more abstract there still is the control factor of insuring light direction and layering of colors. In fact, I had to go through the processes of painting through history and creating my own paints from encoustic to strange vechicles for fat. My professors were always fascinated with my supplies and my knowledge of it all. But again it comes from my need to control it all. Buying the paint in a tube losses the control but creating my own paints gives me the control.