Don't know why I'm obsessing over this...
Back out in albie land today, after landing one hard pulling long running football, purposly neglected to retie. Wanted to see how many fish I could get on the one clinch knot [I normally retie frequently].
Number two, after several long hard runs, wrapped me around the dreaded lobster bouy. Next followed the tug o' war as I tried to free the fish from the pot line while it made runs against the rope with maybe four feet of leader. The runs were hard enough to pull the bouy under. Somehow the fish came free and I landed it.
Same exact scenario with number three except try as I might, I could not free the fish from the damn bouy. After seriously considering swimming for it [it was down too deep on the rope], I had no choice but to pull until the leader broke. The blood knot between mono and flouro held and the tippet broke close to the fly. Although I don't know for sure if the clinch knot broke, the end of the tippet was frayed for about three inches. I believe it was abrasion and not the knot which broke.
Flouro was again the Vanish brand @ 12#, improved clinch, six turns.
Not sure what I proved but I believe I got this out of my system.
Now if somebody would just invent an invisible tippet material that could cut through rope, I'd have it made.