I definitely got the tingles and the little odd feelings the first few implants I had. Particularly my left and right P0 implants… it happened for years but eventually quieted down.
Strangely I didn’t notice anything for any of the additional implants I got much later. For years I was rocking just the two.
I think the hypothesis is correct… nerves are regrowing and tissue is readjusting and encapsulating and that causes some strange sensations.
For the sensitivity, I think this might be psychosomatic as you are focused on the sensations. I think this is also the reason that I no longer feel the tingles or weird sensations with any of my implants - it’s super old news to my brain and I am effectively ignoring any sensations that might bubble up… filtered out like noise before hitting my consciousness. I still feel it of course if I jam my arm into something and a flex implant is forced pretty far out of position, stretching the tissue and putting a lot of pressure on the edge of the flex… but the little tingles and whatnot are a thing of the past, even for relatively recent implants.