At my little local spot, I've tried squid and prawn bits ona jig with no joy.. have had best results with an unweighted, un-baited jig that I just float out into the berly trail.
When this doesn't work, a little bit of bread on each hook and bobs ur uncle.
I burley up with bread crumbs, sometimes with a little bit of tuna oil mixed in.
When unweighted jigs aren't working, I throw a small sinker on and let it sit a little deeper
Unweighted jigs with bread have landed me some good live garfish too! dynamite bait!
What i have found with the cheaper jigs, is that sometimes the hooks aren;t very sharp, or corrode enough to maek them blunt after first use... you can still get them on blunt hooks, but you loose alot of the little buggers too..
Whereabouts are you based? I tend to go for midweek baiting sessions, if you're nearby, Might be able to come out with you..
Good luck!