Soft shackle question

[allene]

As a general observation, a stronger stopper know would be something like an Admiralty stopper or a fishermans knot. By that I mean a knot where the line makes no bend until it gets to the back of the knot and then works its way forward so that the constricting force that holds the knot does not come from the first part of the knot, but from the last part. I am not sure I am saying this clearly but just think that the line enters the knot straight and goes all the way back and then other parts of the line wrap around and make the knot in some way.

That is why I tried the Admiralty stopper first but as it slipped, it was not a candidate. Many knots slip in HM line. A bowline slips for example. Even the stopper recommended in a Youtube video (that I can't find right now) slips. It may be possible to combine knots to make a good one for this. For example, an Ashley stopper does not slip so perhaps an Admiralty stopper followed by an Ashle stopper.

My boat is having some major work done right now so knot work is on the back burner. I have a spool of Lash-it that I plan on using in my tests. It is weak enough that I can break it with my 30 power winch. It frightens my how much force I need to put on 7/64 line to break it and I can't break 1/8 line without additional purchase.