Long journey to get Cintiq 21UX running smoothly with Photoshop CS6 on Windows 10. A few current issues.

Hello all. I've had a Cintiq 21UX for a while now and I've never stopped fighting it. I'm trying to solve several issues that arise when using CS6.

I am using a Wacom Cintiq 21ux on a Lenovo Ideapad U530 Touch on Windows 10.

Here are my main concerns-

1. Pen keeps spewing out blotched lines without pen pressure, as though pen pressure has been disabled for a split second.

2. After a brief session, pen pressure will disable itself, and the cursor will additionally start to become jittery, requiring me to close down Photoshop, go to Windows' "Services" option to right-click and restart "Windows Professional Service" before opening Photoshop again.

3. There is a shortcut in Photoshop "Control + Alt-drag" which creates a duplicate of the selection as a floating layer. This frequently gets in the way of a "Control + Alt + Z then draw again" because I may make a mistake and use the pen before clicking the Z, which requires me to then go and delete the new copy layer that I accidentally made. I do not need this shortcut, but after looking through all of "Keyboard Shortcuts..." in Photoshop, I can't find it so that I can turn it off. The reason I know about it is because it is listed here (under "Use Vanishing Point")- Default keyboard shortcuts in Adobe Photoshop

Regarding 1. and 2., I've done various things related to disabling "flicks" and "Windows Ink", but I haven't been successful. Drivers are up to date. I think 1. and 2. may have to do with conflicts with the native Windows tablet system (along with perhaps the Lenovo's touch system) and the desired Wacom tablet system, but I think 3. has to do with Photoshop, so if anyone could help me with any of these, it would be great!!