No tilt on Surface Book 2?

[Quia]

I'm trying Paintstorm on my Surface Book 2. Brushes and features are pretty great, and the interface doesn't give me a headache! I would make this my main painting program on Windows if I could get the tilt function to work. I already have pressure sensitivity working with the latest Microsoft drivers and Wintab drivers installed, but I can't find any option that will make tilt work. Does anyone have tilt working on any Surface device?

Tilt works for me in Artrage, Corel Painter, Clip Studio, Krita, and Window's built-in Sketchpad and OneNote. In Corel Painter, it is necessary to use "RTS" mode instead of Wintab. In Clip Studio Paint it is necessary to choose "Tablet PC" instead of Wintab. In Artrage, I'm using RTS and tilt won't work if Wintab is enabled. In Krita, I have Windows Ink instead of Wintab enabled.

So is Paintstorm using Wintab only, which doesn't seem to register tilt on my Surface? Please support Windows Ink so I can buy Paintstorm instead of the others