They were “success factored” but, like you, I can’t recall if they might have actually also been 5A coterminous with the bump up….in any event, it was close I believe.
With that, I’d argue the only true 5A school to actually win 5A is Snider (in, arguably, the most exciting State Championship game I’ve ever watched). I realize that Westfield was technically 5A when it won but by everything I’ve read or seen both then and now, they were well into 6A student population the year they won.
Truthfully, 5A has only ever had one legitimate “home grown” power - Snider. Every other champion has generally been jumped up 4As or a sole 6A on its way out.
I’ll not pat myself on the back too hard but I called it back when 5A was given its mutant birth. 5A is essentially where every good 4A team wants to graze because the pickings are so easy.