yeah, 8 Layers is to much do saw at a time. A stacked set of woods is much harder than a single piece.
Split the pile, make it 4 layers at a time. That's tough enough, and you can go with the usual SR#5 or a SR#3 for the small bits. I have UR-blades too, but I didn't get into using them really (yet!).
regards
Torsten