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I may not be able to explain this properly, but I'll try.
Leather and hard rubber offer no resistance because the tip of the firing pin exerts quite a bit of pressure in a tiny spot. It simply either cuts through or crushes the material. The force of the pin needs to be distributed over a larger area. This is why commercial snap caps have a metal "primer" that is either sprung or cushioned underneath.
So, even though you think your homemade caps have been working, you just have been lucky all these years.
You can make caps that work, but it would involve using a metal disc that is primer diameter, that is glued in place with a thin layer of silicone rubber. The disc will absorb the blow from the firing pin and the thin layer of silicone rubber will cushion the disc. I would think that eventually the silicone would lose it's grip and the "primer" would fall out. This is why I suggest commercial snap caps.
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