@kumakahn Exactly...unfortunately for us all, there Are no sources of sound, scientific information that relate to sound characteristics like the ones you mention. That sort of thing, AFAIK, is not to be found in science, per se, but only in marketing...hence we rank ametures are having to try to do it all ourselves, basically.
In the early 2000’s I got into it because of the raging debate at the time of which was better, stranded or solid core...I mean about half the manufacturers were saying that stranded was clearly the "greatest" and the other half said solid core - the only thing I knew for sure is that they couldn’t both be right. That’s when I started experimenting myself, however crudely, it didn’t matter to me, with some orphaned wires I had accumulated. The materials used have an impact. Online I looked at topics like dielectric absorption, which was helpful, but drew no correlation between that and sound quality, per se...only measurements, mostly. But, the experimenting taught me more about what relates to sound quality than anything else. It’s just that I had to carry out repeated experiments over time, a few years in fact for me, in order to be sure I was not inferring something that wasn’t there. Even so, I don’t have any scientific "proof" of what I hear, and yet it’s demonstrable all the same.
