So now I know the above type of hiking pole end wont work safely when loaded on the end with this type of pole holder.
These are flex tip poles and that is typical on most, but these Komnperdells have two buttons that stick out on the sides that are in the way.
I now think the downward break was due to the way the pole holders are set up. IE you have to twist up the outer strap to get the pole end in. This imparts some downward rotational force on the pole end when you really want a purely axial load especially loaded on the very tip.
Obviously when I tried the longer length that increased the axial load and the bending force on the end of the tip and snap. No warning, nothing just an arrow and bow.
I think this type of tip below will work so I am switching to Leki poles for the more robust expansion nut, supposedly higher quality aluminum and the tip. The Leki tip looks the exact same to me as the black diamond tip.
This time it will be loaded on the shelf which is over the Alum tubing, via a washer. Not sure how much pressure it will take and that would take some destructive testing but I think it will work fine.