You're right to point out that the "classes" that shoot "High Score" vary wildly around the country. Indeed, we have a preponderance of Hunter Div. shooters in Texas.
Oddly, we have only a single regular Open PCP shooter, and just a couple WFTF PCP shooters, and one of them (nationally known) is having severe back issues at present... hasn't shot in nearly a year now. Both these situations are rare by comparison with other areas of the country, where Hunter shooters are the minority is some cases.
One of the benefits for me in travelling to Regional GPS in other areas, is the opportunity to watch -- and shoot with -- excellent shooters in the other divisions, since I see so little of it locally.
I fondly remember shooting Nats last year with Don Carkhuff and Vlad Berchanskiy, both OPEN Class shooters. Watching these friends and their shooting styles was a delight. Among other things, it convinces me that it is beyond pointless
to compare scores among the three divisions, as if they compete with each other. They don't, IMO.