About your center of attention response... I thought it was that HPD people don't like to back down and be quiet like you said. I thought it was the other way around, that they will make themselves the center of attention to avoid that discomfort.
And also, about the shifting emotions, I thought it was shifting from very happy to very mad to very sad at miniscule things... Shallow meaning that something like a stain on a shirt accounting for intense anger, or a sunny day influencing a happy mood.

I guess you're not the only one looking for clarification on the matter.