Great to hear you actually did some testing rather than relying on our own opinions. It is revealing isn't it?
most of my line breakages occur while trying to land a fish by grabbing the line
That is exactly how my standard non-slip loops broke over the past weekend's field testing.
Also the fact that the regular clinch broke the non-slip knot could likely be a sign of how the knot degrades with stress, it never broke on the first thrashing fish but it did after several for me.
There is a mix of objective and subjective in your analysis but what I have found putting preferences aside is that the palomar or trilene does not break off when holding the line where other knots often do.
The IGFA considers the palomor to be the strongest knot. I am trying to find out how they arrived at that decision...