In short, the longitudinal stability at some point became compromised.
Concur fully. That is why I've been looking at unpopular concepts like dynamic loss of control recently. It even fits the rudder limiter position as discovered which most scenarios do not explain.
Dynamic loss of control is rooted in servo theory and relates to PIO.
It appears that if one does not work with stability and control on a routine basis, it is as easy to comprehend as Ancient Greek.
Come to think of it, the formulas are full of Greek letters.
