Brandon, the line was not stuck in the underlying line following the breaks.
I think that is because the underlying line (first ~200 mtrs) was manually spooled under high (+6 kg) pressure (with belt, gloves and many pauses
) and you only cast and rewind the outer/last 80 mtrs or so. There simply were not enough "loose" line to make it get stuck.
However, there were enough loose line to cause enough extra friction/tension when the fish was taking line against the heavy drag so that the relatively more loosely spooled line was pushed to the top/bottom of the spool to cause a temporary stop. The closer to the boat the strike occur, the more loose line you have on the spool.
We saw this happening when dragging out some 80-100 mtrs of line on land, against the same drag we were fishing with. When we stopped and turned the rotor, we could continue to pull out line and there was no clear "evidence" that the line had dug into the underlying line upon occular inspection.
Since this happened on three different spools, all with new line (JB130lb, TT130lb and TT100lb), I do not believe that a bad batch is the culprit.
Again, I am surprised that not more people have experienced similar problems.
I will shift to solid line on my next trip and also use SOM spools rather than JM spools and see what happens.