To the developers of the XPS 9575 and the Premium Active Pen, I would invite you to try to get tilt functionality to work correctly in Paintstorm Studio. Use the dirty impasto oil (for example) and set the angle to direction. The software can see the direction/tilt of the brush, but as soon as you touch the pen down, it glitches. This is similar to a problem I had in Krita, that was fixed by choosing Windows Ink. But Paintstorm Studio does not have an option to change to Windows Ink. I hope you can work this kind of thing out and post a driver that can fix these situations as not all the paint programs have migrated to Windows Ink, many still are dependent on working Wacom (wintab) drivers.
I have also found that setting up with switchable graphics to high performance in the Radeon settings improves the brush tilt behavior in Paintstorm Studio.