Thanks for the cool post. As a long time guitar and piano player, I have watched many a musician (myself included), underestimate just how tricky it is to properly tune a piano!
While I'd need to study quite a bit more to fully understand EXACTLY where we are going off the tracks, your post has at the least, given me a launch point and a word to associate with the source of this phenomenon: INHARMONICITY! Thanks!
Hey @cryptanjoman !
For quick video explainer on the basics of piano tuning and temperament, I recommend this video.
You are the man! This short video makes a complicated subject quite intelligible! Thanks!