When using Wayland with touchpad, mouse jitters at the end of a motion

I first recorded this on askubuntu.com, and was told there to take this to launchpad.

https://askubuntu.com/questions/1014356/touchpad-pointer-jitters-shakes-when-done-moving

I feel like this is a touchpad sensitivity issue, but it's a bit weird to me.

This is happening on 18.04 (was trying it out to figure out an other bug, somehow still using it), Lenovo Thinkpad T440s

When I move my pointer using my touchpad, the pointer jitters if I leave my fingers resting on the touchpad after the move. If I lift my fingers up after the mouse move, the motion is smooth.

I've got a screen recording: https://i.imgur.com/A1HmjUa.mp4

Everything else about the touchpad motion is fine. It doesn't jump, it might be a bit slow, but it tracks fine. It's just this shaking thing that happens at the end of me moving the mouse. It has as cascading effect that if I am scrolling with the mouse sometimes the entire window that is being scrolled on shakes at the end of the motion.

When I plug in a USB mouse the shaking doesn't happen, which makes me think that it's a sensitive touchpad.

Switching to Xorg still has the problem, but there I can fix it by tweaking the VertHysteresis and HortHysteresis. I don't know how to do the same for Wayland (and questions on askubuntu seem to imply it's not possible because Wayland is jittery). Am I then stuck with a jittery mouse if I want to use Wayland?

Switching to Xorg loads me with different problems like the mouse being clicked while I'm typing.

sudo libinput list-devices
Device: SynPS/2 Synaptics TouchPad
Kernel: /dev/input/event5
Group: 8
Seat: seat0, default
Size: 108x95mm
Capabilities: pointer gesture
Tap-to-click: disabled
Tap-and-drag: enabled
Tap drag lock: disabled
Left-handed: disabled
Nat.scrolling: disabled
Middle emulation: disabled
Calibration: n/a
Scroll methods: *two-finger edge
Click methods: *button-areas clickfinger
Disable-w-typing: enabled
Accel profiles: none
Rotation: n/a