G’day mate my jigheads vary from 3/8, up to an ounce in certain conditions, majority of the time I fish a 1/2 ounce. I usually fish in depths of 6-15 meters, I generally keep it fairly simple just single hops along the bottom. 95% of hits come as the lures sinking back to the bottom, always need to maintain contact with your lure, few little hints when you give the lure the hop follow it back to the bottom by slowly dropping your rod tip towards the water as the lure sinks, strike at the faintest of touches, and cover as much water as you can. I generally find in the deeper water you won’t get as many Flathead but the ones you do get are always solid. If you wanna practice your techniques I’d fish shallower depths with the smaller swimmerz and lighted jig head say 1/4 and target lizards specifically. They will happily hit lures and gets you practice as to striking at the right time etc.