You have to set Wacom’s drivers to report their full 2048 levels of pressure. On Windows machines, they default to 1024 levels of pressure reportage for legacy compatibility.
I mentioned this on Twitter and it blew a few people’s brain-pans out their collective skulls. I don’t think folks know. I imagine 90% of people with 2048 Wacom hardware have left that option checked.
Unless you’re living in a cave and clinging on to your copy of Painter 6 with musket in hand, uncheck that box.