My only thought on the problem might lie in the testing method and the line's posted strength.
The method sounds solid enough, but how do you know if 5 feet of line will give the same results as 1 foot, or 3 feet or even 10 feet?
As for the line's posted strength, how do they gauge what the breaking point is, and is it determined by the same parameters as your test or maybe based on the extension of line during a long cast?
I'd hate to have anyone waste good line for nothing, but if you can verify that the line breaks at specific pounds of force, at various lengths, and it does so consistantly, and does so with more than one spool of their product, you would have reason to complain to the manufacturer about possible misleading information about their product.
Unfortunately you can't base the results of any tests from one spool as proof of a product-wide problem, but it's a step in the right direction.
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