Thought I'd chime in with my $0.02. This might sound like a cop out, but in my opinion if you really want to catch more jews, stop wasting your time and energy in Sydney. Sure, there are jewies around, and there are some dedicated guys who get onto them semi consistently, but the population of jews in the northern Sydney region is fairly small, and catches are slim for the vast majority who target them. I no longer fish for jews in Sydney, I just don't have the time nor patience to be going out and coming back fishless time and again. Instead, I've got a handful of spots a number of hours drive north that produce consistently. Spots that I know I can fish hard for a couple of sessions and generally catch at least a couple of soapies, with occasional encounters with larger fish.
Others make some great points. Scratchies list is spot on. I guess the key point being to fish known jewie spots. The fact is that there are a multitude of spots up the north coast that hold so, so many more jew, that I find my time and energy better spent planning a few trips up there each season, and generally catching a few jews each trip, and spend my time in Sydney targeting other species.
Pat