Hi Hayden,
The tape and cairns are mostly my work, but as you acknowledge there's not much in the way of landmarks around there. Plus with all the rain we've had that tends to cop a fair bit of runoff which may well have destroyed some cairns and altered any landmarks.
Sounds like you were on the outcrops to the right side of the main watercourse. A "mini-slab" could mean a number of spots, but I suspect if you'd come up a bit more then traversed left you'd have been able to get across into Count of Mounting Crystals.
My recollection was if you traverse left a bit lower into the watercourse/gully you end up soloing up some easy slabs (but no easier than some of Nobless Oblige!) and to a large tree on your right then stepping down gets you below Noblesse.
I'll try and dig some old photos out over the next few days to refresh my memory and post something up. Hope that helps.