A big problem with the papers is that there is a big assumption made. In fact its a ridiculous assumtion.
The reality is that the spring force changes whenever the advance is adjusted.
When we reduce the advance available, it reduces the tension on the spring.
So the retaining force on the weight is less than it when more advance is allowed.
That, and the lack of compensation for the exponential increase in centriple force are two of the disadvantages of the YH-YT advance design, especially with big cams.