Hi Bec, and welcome to here in case I missed your intro elsewhere! lol
only thing I can think of apart from the above posts is
flongies? (fleece long pants that work as a cover)
we had great success with Longies (wool ones) and I was
keen to try Flongies for the same/similar reason
also don't have to worry about clothing working it's way between the nappy cover
and nappy resulting in wicking, because the flongies cover the nappy/crotch/thighs...
(am guessing your title is meant to be 'wool' not an option? If so I'm sure a friendly mod will help you out with altering it 
only ask coz I had to re read your OP twice lol to make sure I read wool/fleece)
so we had a PUL outer fleece inner pocket nappy (PeaPods or Fuzzi Bunz), with only bamboo inserts, then
wool longies/soaker over the top - the PUL did the main containment and the
wool offered that bit 'extra' for overtime pee, and more evapouration...
sounds like a double whammy but it worked and it was a good option so I was happy
and so was Zeke's bum!
dunno if it would work the same with flongies instead of wool longies but can't see why not?