I am too old to remember to re-tie
Not to deviate too much, but I suspect (a theory) that comparative knot strength of various knots may be a function of the brand and type of line. I remember a Stren salesman that would demonstrate that 10# regular Stren was stronger than 12# Trilene XT. He used a shock test to demonstrate. Under a steady load the XT was much stronger. Could be that some lines test at near 100% with the non-slip loop and other brands don't. The knot strength of various knots may be a function of the line used to tie them.