Hi Ted -
In SWFF the most common line is the clear or semi-clear intermediate and lines like the Rio, Airflo or Wulff are tough coatings bonded to the core. I've not had any such problems, but I do recall that while winter steelheading with sinktips made from shooting heads I've had the problem once or twice when snagged but never on a fish.
My first choice is a cement splice, which is so streamlined and the same diameter as the line itself. I've found the old nail knot to be a little stronger but neither have given way on a fish for me so far.
Curious, what method do you prefer instead?