As an important sighting if this is Melaleuca biconvexa, I would like to see it in flower to be absolutely certain of the ID. Also notes in the comments field and/or a photo of the bark.
The leaves give no doubt if its ID. This is a high altitude occurrence of this species, which is usually on the coastal plain, where it is quite abundant in a limited area. I know of only one other high altitude site, to the north of Braidwood Road.