Hi Dale!
Yes, the back on the Mantle has paperloss. So the technical grade is accurate. But with a front like that, it's well worth the trade off for me.
I've scoured the Paige front/back and can't find anything to warrant a 3. There's always that chance I'm missing something.
Your Kuzava is outstanding. If that is a PSA 3, I'll buy those all day long!