Grif, 71 points is a HUGE disparity. I think it's worth looking into whether your son has an LD. My most asynchronous kid has a spread about half that size, and we were told that it was VERY significant.

There's no template for gifted kids, and it's hard to say what a typical PG 12 year old is like. They are just beginning to wrestle with growth spurts and hormones too, it can be a real mixed bag as far as behavior goes.