I would suggest D. nigromontana for all three Diuris you have posted. D. pardina is quite uncommon on Black Mountain, and the shape of the dorsal sepals in your shots leads me to believe D. nigromontana. In addition, the brown/red markings on D. pardina tend to be more intense.
Matt is correct in his observations. D. pardina is occasionally found on Black Mountain but D. nigromontana is the dominant Diuris species, whereas the opposite is true for the Mt Majura, Mt Ainslie, Mulligans Flat etc.