I spent some time googling and reading reviews and finally ordered these (Headley Tools 45mm Rotary Cutter Blades Pack of 15):
https://www.amazon.ca/dp/B0762HR6WN?...sin_title&th=1
WOW. I'm stunned at how good these are. I kept reading that Headley brand is excellent and I can confirm these are the best blades I've ever used. I've been cutting for a few days now to create my own "kits" so I have projects ready to go. I can cut through 12 layers like it's nothing, no resistance or slipping at all. Unbelievably sharp.