Essentially I aim for tailor salmon bonito etc with metals just like you want to.. When I'm fishing blackwattle bay near the fish markets I cast 5 times max in the one spot. I change the retrieve style every time. A fast, then a medium, one where I rip the rod tip to make it move and stop and so on. I also try and change the depth that the lure is to try and find the fish. If the spot doesn't work move on 10-50 metres and try again. It's easier to use a sling style bag for this fishing. A 20 gram slug in blue or silver is pretty good for this sort of fishing.
Obviously if you can see fish and they're not biting don't move on, keep changing lures and retrieves until they bite. Don't change to bait keep at it and eventually you'll get the hang of it. Mornings I've found are better than afternoon/night for the metals too.