One of the training sessions I did while at GM was on NVH, "Noise, Vibration and Harshness". Most every car maker does those now as consumers see vibrations and noises as problem. (and they should). One of the things that you have to deal with is "what is a normal vibration?". This is important as you don't want to spend hours of time trying to fix something that is "normal". There is no way to remove all vibrations from a machine. The goal is to reduce vibrations to a level that is acceptable to a normal person. In a running engine in your V you have four pistons that start and stop about ten times per second per cylinder. This makes the engine block move around. Engine mounts can reduce the perceived vibration to some extent but some people are very sensitive to even that low level.I notice some vibrations but nothing out of the ordinary for a tiny engine. Would you consider the vibrations excesssive? I can say that in my car I don't consider them excessive.
One thing experience and research showed us was that once a customer felt there was a vibration it was very difficult to get rid of it. Its physics and psychology running head on into each other. Once the owner feels something they will focus on it and their perception of it being a problem will only grow and become stronger. Trust me, I am a trained professional and I can spot and isolate noises and vibrations in about any vehicle made. It bugs my wife even that I notice this stuff all the time in cars. But I also know the causes of these and know which ones are in fact "normal' and which ones are not.
A four cylinder engine at idle is going to vibrate. Its just part of being a very light weight reciprocating engine with a low number of cylinders. I would compare your "vibrator" to another like model of your car to see if one was more or less better or worse. With modern production methods and quality control we don't really have much problem with excessive vibrations. Maybe you are just focusing too much on a minor attribute that is common and normal. Don't fret too much, it will only make it seem worse.