Have you tried microfibre?? I find it great, really really quick absorbing. I use it instead of terry usually and find it works better. For a night nappy I use a tots orignal with a MF then either 2 bamboo or hemp or 1 of each under the flap, I usually use a fleece liner that completely cover the nappy area so no MF touches her skin if it sticks out from the booster.
I'll give putting some microfibre in a go as well, but I'm beginning to think it's me being incredibly stupid (and lazy - thought the spray would be easier and less time consuming) and not lanolising properly.
Luckily Bella doesn't seem to mind the slightly soggy wraps etc.