Such an experiment as the one you've done in your kitchen is really not the kind of experiment you need to do in order to determine whether or not the VR is working. It's way too subjective and so many things can occur that would lead you to the wrong conclusion. For instance, VR is meant to reduce camera shake, right? However, VR lenses also have to work when a photographer is trying to shoot a panned image. So the VR must instantly differentiate between up and down motion vs. sideways motion.
Try doing this experiment when the camera is in manual and all the settings remain the same between VR on and VR off. Also, be sure the shutter speed is at or below 1/200 sec, an area that VR was meant for. Then take a minimum of 3 photos with and without VR. If after this the average remains in favor of the VR off, then maybe you have a problem. However, I'm thinking under controlled conditions you'll find the VR is actually helping.