How do I adjust touchpad scroll sensitivity in Wayland/Gnome?

Go to a terminal and type:

synclient PalmDetect=1
synclient HorizHysteresis=10 
synclient VertHysteresis=10

then keep adding zeroes to the following 2 parameters:

synclient HorizHysteresis=100
synclient VertHysteresis=100

until it becomes not responsive enough. E.g.:

synclient HorizHysteresis=1000
synclient VertHysteresis=1000

Then halve that number and keep halving it until it's just right. E.g.:

synclient HorizHysteresis=500
synclient VertHysteresis=500

synclient HorizHysteresis=250
synclient VertHysteresis=250

When that works, leave a comment with the value you have and I'll edit this answer to give you the perfect answer. If it doesn't, I'll delete...

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