Hi,
yes cinemachine is amazing.
for jittering, it's almost always because the camera is not moving during lateupdate, so make sure all your actions that control the camera one way or the other are executing on late update. You know that either because it exposes explicitly this option ( everyframe, lateupdate), or check in the code that there is a LateUpdate Method. Else ask us if such and such action runs on late update and we'll tell you.
Bye,
Jean