Hi, Mark,
I'm not sharing about this particular PE, but about FG knot. I had a case where PE broke at end of FG knot. Turns out that the PE slice each other because I tie the final knots too hard (pulling too hard)
The first section of FG (PE x-cross each other over leader), the second section (PE knot over leader) we can pull hard.
But for the final part (PE knot over PE main line), don't pull this section too hard. PE will slice each other on shock load. Same case when you have wind knot, it will snap at shock)
So now I make FG knot with mediocre pull for the final part, don't tighten too hard for this final part.
Maybe for different PE line, they have different "slicing-each-other" index, so the same FG procedure may fail for different PE brand.