The position of the break looks like classic thermal / thin versus thick kind of a thing to my limited hollow bead experience.
You may have better luck practicing with transparents. They tend to be stiffer and you can see the thickness some what as you are working.
I do wonder if you are using frit on these and if so you may be adding complexity because most of the commercial frit I get my hands on is 96 coe. If your base hollow bead glass is 104 and then you add frit of 96 your are inducing stress just because of the way the two different types of glass change shape as they cool.
It's a gorgeous bead and you might get away with superglue for a personal use save.
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