Lottie is a really heavy wetter at night, i've have to ditch my WN NN as they are just saturated. The only thing that is working for us is WildChild NN with wool interlock over the top. And i've had to limit her intake of milk before bed too
You might find a wool backed booster would help, as someone has already suggested, i think Puddlekins do them, if they dont its worth asking Ems to see if she can make you something maybe
Or i can lend you one of my WC NN to try
Have you tried Nappies by Minki pocket, that might work, have heard really good things about those and you can put loads of stuffing in there. I was thinking of getting a couple just for spares!
Hope you find a solution, its a right PITA when nothing is working