I googled the nappies and they said they are indian cotton. the only other thing I can think of is a different fabric. I use baby beehinds bamboo, and itti tuttos (not sure what the exterior fabric is on a tutto).
It must be so annoying for you as it's not like you're doing anything wrong and you're still getting the nappy rash. I do the same thing - exclusive cloth,exclusive breastfeeding, change very regularly (I go through at least 10 nappies per 24 hours), cloth wipes, and we don't get nappy rash.