I’m not extremely educated on the topic (only a bit of cruising the web, probably should dig into it a bit more), but from what I’ve understood cinching pressure required to seat a knot doesn’t really apply to the term “high or low pressure knot”, the way that the force is dispersed throughout a knot when applied is what determines the association. The direction of the force doesn’t really matter, for example both a snell, cinch, uni, sdj, or any other multi wrap knot work by dispersing force applied to the mainline by having many wraps that compress as pressure is applied, which applies a low amount of pressure to each wrap within what ultimately makes up the entire knot. On the contrary a knot like a palomar or something else of a similar sort (can’t really think of another) works by having the extra loop that the hook passes through act as the end all be all of the knot so besides the half hitch portion of the knot and the loop that the hook passes through there aren’t any extra wraps to disperse force as it is applied. Now with a mono or supple fluoro the snap of a slack line hookset (which is ineffective for many reasons but I won’t delve into that) doesn’t really apply a massive surge of force in comparison to a stiff fluoro which is where it seems like issues arise. When a low stretch fluoro is made into a palomar and shocked by a slack line set or other event, even when cinched to nearly the breaking point, the knot is held under high pressure and almost explodes like glass when enough pressure is reached, this happens because the knot cuts into itself(my theory is that the wrap that the hook goes through basically rips through the beefy part of the knot and explodes it based on how I’ve seen them break just trying to break them in hand in varying ways). Now the thing is that a palomar tests out higher than other knots on a slow pull and anytime that pressure is applied in a way that doesn’t shock the line, the knot it is immensely strong. Whether the added security of slack line and surging fish shock protection warrants tying a low pressure knot is something I’m still trying to figure out (also especially with big baits it gets old cutting a few feet of line off every time but ultimately is something that doesn’t bother me because it’s necessary). Now I know that I’m overthinking this but it is fun to hear what people think about both my overthinking and some objective stuff about knots from a few.
Yup, the crossing of lines is the death of a knot. If I ever see that it’s cut off and redone immediately without question. As far as knot strength goes I’ve seen before that any doubled knot or doubled around the hook eye knot will test higher than its single wrap counterpart. (Diminishing returns with super heavy line but that’s not very bass related)
I’ve just heard it on a few videos from tuna and a few other guys, it’s possible that it’s a descriptor that they came up with without substantive evidence but the way they described it made sense. Not sure if I’d even be able to find where I heard it anymore but the concept at least in my mind checks out.