Perhaps you meant to write YW
DK in your logbook? Woodycupaldiya is sort of a dog-leg between Darwin and Katherine at 13º 51' S 129º 60' E if that helps.
A possible match for Mulin would be Mulan in WA at 20º 06' S 127º 35' E nearby enough to be sharing the same airstrip as Balgo (Hills) YBGO.
Wide Bay, no idea of airstrips, but look a bit south of Cairns.
Geoscience Australia: Place names of Australia is a great resource for finding clues, as is
Maps - Department of Indigenous Affairs for WA communities.
Regards,
ResBunny