You are correct that eye splices will retain 90-100% of the rated strength. But according to Samson's documentation found at the link I referenced above,"Amsteel and AmSteel-Blue Whoopie Slings have a break strength of 60% of the published average rope break strength." They are good people over at whoopieslings.com but I am more inclined to trust the manufacturer's information.
edit: Here is the direct
link.
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