ask the bp seller/maker, are your breastpads for example, four layers thick?

cos all my experience with bamboo products really, has been items two layers thick, three max. and breastpads are a small item, all stitched around, so it would be much harder for four layers, close together, to dry well. that's the only thing i can think of.

sounds like you have tried most things you could be doing, already. (in my view).

sometimes i see some questions about mould on nappies, on the ozclothnappies yahoo group. People post questions, then whoever, in the entire yahoo group, has ideas, will post them. i haven't paid much attention, as we never had mould problems. wish i had now, so i could be of more use to you!

the only things i recall on the "mould on nappies" topic, is humidity, not washing out nappy bucket very often, washing three or more days worth at once etc. Nothing that would apply to your bps. so back to square one.