Westerly winds are somewhat unpredictable anywhere long the coast between Sydney and Gerroa. It can be 40 knts for 30 minutes and then suddenly nothing from one minute to the next. Only to be 40 knts again 10 minutes later.
In my opinion the most reliable spots in a dead Westerly direction are La Perouse in Sydney and Lake Illawara in the Gong.
I sailed Lake Illawara a few times last winter. Because it's relatively shallow it gets really cold really quickly... and I mean cold. The launch from the yacht club is the easiest. However, the best condition are in the middle of the lake near the markers where it start to get shallow... There is large area of very shallow water that drops into a deeper channel. Once the wind goes over 30 knts there is large area where the small chop builds into steep ramps. They are not big... maybe 50 cms at the moment but they are in a perfect angle so you can hit them at full speed. Good fun. BTW, I dont' use weed fins and found that as long as you stay in the channel the weed is usually not that bad.
I have only seen Port Kembla work once last season. Most of the time the swell wasn't strong enough and the wind blew the ocean flat.
As for Gerroa in a Westerly that's a real gamble. The wind meter is on a house up near the RSL club. The direction always seems of in a westerly but the wind strength usually is about right... sometimes even a bit less than what it actually is. Anything from a NW to a SW direction gets funnelled down Kangaroo Valley and arrives at Gerroa with quite a bit of force but it's usually stupidly gusty so a float board will help making it through the lulls. The best spot to launch is from the reserve on the northern end then make your way upwind. In a North Easter people usually launch from the car park near the caravan park but that's always too gusty in a Westerly.
There are plenty of sharks and dolphins around at this time of the year and the wales should starting to making an appearance as well.
This footage shows Gerroa and Gerringong an ultra strong Westerly: