Variables
Hi again,
First, you are correct in that different manufacturers' ropes have different elasticity characteristics. This is a big variable, making it difficult to compare between brands. New England and Yale, in my experience, are much, much better at engineering ropes than NovaBraid, regardless of construction.
Next, energy absorption is not the same thing as potential elasticity. It might be better to think of absorption over time here. Like a shock absorber vs. a spring. Rope material provides the springiness, buy construction can change how the load accelerates and decelerates, and at what levels. You might want to wander around Yale's site for further details.
As for the thimbles, if you must use one, consider a Newco "keeper" thimble. This is bronze, with loops that keep the thimble from getting sideways and sawing through the rope that it is supposed to protect. But again, I would urge you to abandon that double braid, and splice either single-braid or three-strand to your chain.
Fair leads,
Brion Toss
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