What Jeb is calling a "rabbit tang" is more properly known as a "partial tang." It isn't that any one tang has an advantage, or disadvantage, in strength one over another. Both the stick tang and full, or chiruwa, tang are equally strong and both equally prone to having water spilled on them if the kami isn't careful. The stick tang being thicker should hold up better if Jeb's theory was correct in the full tang being wider, what it makes up for in width it loses in thickness so if water is spilled it is going to harden that area and either are equally likely to fail if that happens.
The partial tang is just as strong as the other two. The problem doesn't lie with the tang, but the handle as it has more stress put on it because of its construction.
However if you drill and pin the handle and tang together, just takes one, it will hold until hell freezes over.
And you can beat it up just as hard as the other two tangs.
On the other hand there was an old style Hanuman that had seen several years of hard work in the field with nary a problem.
One just never knows when it comes to khuks.
I haven't checked out my Berk Special for a while but I'm almost certain that it is a partial tang.
Personally if I were going to use it, or any partialed tang khuk, I would most definitely pin it.
I just don't like surprises, or making new khuk handles because I have too.
