I haven't used the little gumnut ones, but use LLS heavy wetter & holden's landing bed bug plus.
The LLS HW is great. I didn't think looking at it it would hold as much or last all night, but it doesn't the job brilliantly.
Eleanor is a heavy wetter over night and these last a good 12 hours!
I like the trim fit of them too.
When I was searching for night nappies, I messaged LLS something on facebook about the HW v's SHW
Here's what they said.....
Me: Hi, needing a bit of help with your night nappies. At night DD is out widdling our boosted day nappies, so looking at your nappies as a possible option to stop the leaks. unsure of whether need light, regular or heavy wetter ones?
LLS: A Super Wetter nappy would be too much overkill I think but you might want to try a Heavy Wetter as, unless she's a monster wetter (which it doesn't sound like lol) you'll be pretty much certain of being leak free.
For the Luscious Little Nappy I'd suggest heavy wetter, which has heavy bamboo and zorb in the core, plus heavy bamboo and zorb II in the inserts. The super wetter can tend to be overkill and only needed for the most heaviest of wetters. We used to use BBs during the daytime with Ella when she was still in nappies and she was a regular wetter really so microfibre may be part of your problems.
We use lanolised wool covers as they allow some of the moisture to evaporate off and wool can absorb about a third of it's own weight in liquid without feeling damp so long as lanolised well. I think you'd do fine with a heavier wetter. The super wetters tend to be used by toddlers close to potty training when they are holding on and then flooding nappies too or taking in a lot of fluids. Other thing is if you're close to going up a nappy size you can notice a fair bit of difference in absorbency as the next size up just by being larger has more absorbing fabric, can be boosted more, plus the fit can alter things then too.
Hope that helps