Hi Paul
I live in the area and have fished the spots you will be likely to fish a fair bit and there is definately some excellent GT fishing to be had, there is the Abbot point coal loading jetty that holds plenty of fish and Cape Upstart has some rocky headlands
that hold fish although sometimes they can be downright stubborn but thats GT fishing !!!
there is another island out wide of Camp called Holbourne Island that is pretty good also, should be plenty of Mackeral around that time of year too at all these places
most fish we catch around these areas are between 6 and 20kg with the average being about 15kg but have hooked and seen much bigger fish ( especially around the jetty )
We usually fish Pe 6 with poppers like the 100 and 125g Cuberas and that seems to do the job on 99% of fish
Pencils should work nicely on the Mackeral if they are hungry and there are some monsters caught around the jetty at times
Cheers John