It's still a bit of a work in progress Bill....
All I've got is this from another post.
Very Rough marks for the following taken off Navionics to give people the general idea of where to look.
Tweed Canyons: 28 14 538 153 54 514
Riv Grounds: 27 46 356 153 57 561
Cape Moreton Canyons: 26 49 173 153 44 280 and 26 57 583 153 48 803
Noosa Canyons: 26 15 860 153 51 947
So as for places to try I'm open to suggestions