Jacks are my favourite fish. The hardest pulling critter pound for pound I have ever caught, and would be very close to the best tasting fish I have eaten.(and I love eating fish)
They take a wide range of hard bodies, but my fave method of jack fishing remains live baiting, with poddy mullet being the bait of choice when I used to target them.
I spent six weeks earlier this year over in Exmouth in WA, and targeted jacks in the local marina and found the local population of jacks were a bit lure shy, but I had great success at night or dawn with live bait or even mulies. I used 15 kg line with no leader and a 3/O hook with minimum amount of lead I could get away with. I actually prefer handlines when jack fishing and unless I turn a fish within a second or so of it smashing the bait, it was all over red rover.
Prior to that, my jack fishing was mainly up in NQ, and I used similar methods, and can't see why it wouldn't work anywhere else where jacks live.
With some luck I can get up to the sunshine coast this summer, and try around maroochydore, noosa etc and catch a few.I am sure that those canals would hold a few.
Anyway, enough rambling, but those are my experiences with jacks.