Personally I'd ditch the microfibre and also the fleece/minki, sometimes wee can wick off it, rather than soak through it in my experience. I wasn't using any liner for a good year or so of our nappy using, we'd gone completely for bamboo with wool over the top.
Last night in the WNNN went well. No leaks! I'm going to but a couple more NN if things go well and save myself the hassle if trying to find what works. Once I get better at using cloth in the night I may start to play around a bit more. Thanks for all the advice. At least I now know the best way to stuff a nappy!