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What I have found is more knot failure than actual tippet breakage. This is easy to spot as the knot unwinds and leaves a curly q. I also cast a few wind knots and those are definitely weak spots. I spot those by checking line and have had them break if I don't retie and get a bigger fish. Just as you note, 5x and a 5wt can land a stealhead, so I think it might be something else.