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I've not seen your video yet.
back when I was younger and knew a lot less, my mechanic told me the vibration of the engine is inescapable because of the lack of balancing in the engine (or something to that effect) however, he did significantly lower the vibration in my 145's B20 motor by adjusting the valve lash.
I've done the same and had mixed results with different cylinder heads. One ran smooth as silk, another is just wobbly, no matter what I do.
Adjust (or have someone else adjust) your valve lash.
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