Edgy lines in SBP 5.5

I’ve just gotten a new computer and updated to SBP 5.5 (from 5.1). When I draw now, the lines comes out edgy. Sometimes it gets really extreme. It happens no matter what my smoothing settings are and when I try to draw in other applications the circles comes out fine. Also my new computer is a lot more powerful than my old so I’m pretty sure this is a problem in SBP. Has anyone else run into this issue or know what might cause it?

Which model graphic card does your system use?
What is the tablet model?

In the preferences of Storyboard, what happens when you
uncheck the “Realistic Preview while drawing” feature on
the Advanced tab of the preferences?