Reference information courtesy from ARP-bolts.com website, select their "Tech" and then "Installation" page:
The Stretch Factor
It is important to note that in order for a fastener to function properly it must be "stretched" a specific amount. The material's ability to "rebound" like a spring is what provides the clamping force. If you were to simply "finger-tighten" a bolt there would be no preload. However, when you apply torque or rotate a fastener a specific amount and stretch it, you will be applying clamping force. The amount of force or preload you can achieve from any bolt or stud depends on the material being used and its ductility, the heat treat, and the diameter of the fastener. Of course, every fastener has a "yield" point! The yield point or yield strength of a fastener is the point at which the fastener has been overtightened and stretched too much, and will not return to its original manufactured length. As a rule of thumb, if you measure a fastener and it is .0005˝ (or more) longer than its original length it has been compromised and must be replaced.
https://arp-bolts.com/p/technical.phpDunk the Funk - perhaps the answer to your question is more related to the main stud's "yield" point. I have used ARP bolts/fasteners and they have excellent products and service. Alan