If you are getting 2 or 3 small ones, then your in a good spot...
i dont know the area, but i would try walking around 20 meters either side of the wharf and see spots around there...
if they are there, then it means they have the right habitat to live there, so you will find more..
problem with squid is that they move around alot, so you may want to try 3 spots or 4 spots in the same vacinity, and just loop through them..
Spot 1, then 2, then 3, then 4, and back to 1 and do it all again.
I would spend around 15 - 20 mins at each spot (if you are catching nothing) and stay for 15 mins after the bite stops etc.
hope this helps increase your squid catch..