Damping on Body Transposer jitter at constant 60 FPS

Hello,

I have a jittering camera when i put some Damping on the Body of a Transposer...
I move my player in Update, and the CinemachineBrain is set to LateUpdate. When I have 0 damping, it work perfectly, when I have, it jitter:


Here is the result of the lag:

Here is the brain & vcam involved:



My Unity version is 2019.2.0f1
My Cinemachine version is 2.3.4

I have also tried SmartUpdate: it's the same. And FixedUpdate is worst
I move my player on Update, with of course Time.deltaTime.

I have tested in build and in editor: the result is the same.
I have this settings applyed to the game:

Application.targetFrameRate = 60;
QualitySettings.vSyncCount = 1;

I really don't know why there is jittering on the damping... I have everything up to date, and it seems like i do everything correctly :/

Thanks you