I have been adding 2 Cotton Babies inserts into the Bumgenius for overnight. It is very bulky and I have had some leaks. Last night I tried 1 Cotton Babies insert and 1 Hemp Babies Diaper Doubler without a leak. I was wondering if I could just add 2 Hemp Babies Diaper Doublers and no Cotton Babies insert? The Hemp Babies Diaper Doubler are so thin. Or does it have to have the Cotton Babies inserts to work right?