Issues with touchpad (ETPS/2 Elantech)

[sourscreme]

Hey im new to linux lite. Yesterday i installed it on my older notebook (Acer Aspire E1-771) because win10 been way to heavy for him.
Im really surprised how useable this notebook got, otherwise it could been went straight to the bin.

Everything went fine, but i noticed my touchpad worked little weird. Even if the touchpad felt really good and responsible, the scroll bar been on 50% of the whole right side of the touchpad.

So i spend some after hours for a solution. I found out the driver my touchpad is using is synaptics, so i watched for some update or other version of it.
Somewhere i found this code

Code:

sudo apt remove xserver-xorg-input-synaptics

Code:

apt install xserver-xorg-input-synaptics

I restarted my notebook and saw the issue was gone, but i got another one. Touchpad now works everywhere but it feels really bad and the cursor is shivering.
At the Mouse and Touchpad Setting i tryed to tweek the Pointer Speed but looks like this setting arent even responding.

In the Mouse and Touchpad Settings its say my Device is ETPS/2 Elantech Touchpad.

Any ideas ?
How to reinstall synaptics ?