Hello James,
bundleArray was made to bundle the points to cross eg. curves. So it limits the output to the shortest input array. In your example the splitted arrays have length 180 and 183?? - so the output is 360 long. I have tried to make numarrays with 14 and - 14 (progression node) much longer as needed, bundled these - splitted the points/pointsext and injected the angle rz. Then used transform-rotation to orient your pathes and avoid that problem, but without success. So the problem seems to be somewhere else. I am very busy at the moment, so I can not have adeeper look. Sorry for that.
@Pilou: Please have a look to the progression node to generate your numarrays. After that also to the math node.

A nice day to all
Karsten