I'm not very sure about this one. In the brush settings the graphs for X-Tilt and Y-Tilt have an x-axis range of -30° to 30°, but upon testing it appears to actually be (left to right) 60° to 0° of the absolute value of the tilt angle w.r.t the Windows tablet handling (I tested using pointer input events with the tilt fix patches, but it probably is the same for WinTab, but I am not really sure.)
Qt at least puts it in the -60 to +60 range: http://doc.qt.io/qt-5/qtabletevent.html#xTilt
There is a "small" problem. Our "Tilt" sensor actually takes absolute value of the tilt. So, the actual range is 0...60deg.
The problem is going to be fixed in this MR: https://invent.kde.org/kde/krita/-/merge_requests/265
Git commit 7ead80667e466b687b7424ba41ff26d13e41df6f by Dmitry Kazakov. Committed on 12/03/2020 at 21:01. Pushed by dkazakov into branch 'master'. Fix labels for xTilt and yTilt sensors Actual range of our tilt sensors is -60...0 degrees. The range is reversed to work better with size/opacity options. M +6 -6 plugins/paintops/libpaintop/kis_dynamic_sensor.cc https://invent.kde.org/kde/krita/commit/7ead80667e466b687b7424ba41ff26d13e41df6f