Humesy, i've had the same problem fishing Dee Why the last few weeks as well. One thing maybe worth noting though, last time I went down I switched from beach worms, which I usually use, to nippers. Bagged 4 keeper Whiting and a couple under-size Bream in a couple of hours of fishing with no trashy throw backs, don't know if this has anything to do with it???
Cheers,
Mark