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I bet these "small vibrations" are due to some kind of coupling between the mains and the case. Dunno, not an electrical engineer. See if it still happens on battery power.

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That is likely correct. Lenovo has an article about it here: https://support.lenovo.com/us/en/solutions/ht505170-informat...

We actually use a 3-prong AC cable to prevent this from occurring.

No, it's nothing electrical. It's all mechanical. It's the surface which is slightly striped or bubbly or whatever and when sliding the hand or finger lightly over it, it generates a vibrating feeling. It might be less now after some months of use. Maybe the small cracks are filled with finger fat or something :).

The sharp edges are still there though.

Are you sure? I've also had this vibrating issue and for me 100% it was some sort of grounding issue with the power. Have you tried testing it when the ac adapter is disconnected? Its sort of feels like a very low amperage electrocution whenever you rest your hand on the laptop(if you know what getting electrocuted feels like)

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