I found that the best combo for Jamie is a babeco bamboo night booster and either a WN hemp NN insert or Hemp babies Bigger Weed underneath. I use either WN night notions (got a couple of lovely cotton velour ones
) or Babeco Bootylicious. I also put on 2 layers of wool, soaker plus longies, his backside is enormous with all this on but it does mean a nice dry boy/bed/grobag. I've not tried fleece soakers or sleep suits so I can't offer any advise on those. Jamie certainly wouldn't make it through the night with a NN insert without adding a lot more boosting so maybe some more hemp layers might help. I don't use any microfibre at night anymore as I think it tends to squishes out excess wetness.
Hope you find a solution.