Hi Greenpalm,
I have some experience with pg/AS kids. Everyone here has given you good advice. It's true, there can be a fine line between PG and AS. Your ds may or may not ever be diagnosed. Either way I think your concerns are very valid, and you'd be wise to focus on those, regardless of a label. I have worked with a social skills group for kids and some of them have labels, others do not; because their parents have chosen not to go that route.
It sounds to me like learning how to best help him, or finding someone to help him wend his way through the world will be valuable. You have clearly already been doing so, and reading up on this is your best bet.

feel free to pm me if you would like more info.