Unlucky Tom!
My guess, through my experience of making pads, is that the softness of the material has played a big effect in them falling apart.
Glue is very strong in tension, in shear, but poor in peel (relatively). With a very soft pad (as the red RimJams are), the surface tends to try and 'slide' forwards/backwards when you brake, which in turn tries to peel the material from the backing. I think you can see the effects of this in the first picture, on the left hand corner, where its standing away from the backing after peeling.
The harder pads (green being the hardest) do not suffer from this anywhere near as much (although, of course, all materials will do it a small amount).
Give Chris a shout, see what he can do for you. Im sure he'll help you out in some way (Y)