Wish I could help. Its been a challenge of mine for many years. The few I have caught have been by the Westshore Bridge (years ago), LeQuense Road several over twenty years. The wharf 40 years ago (big yellowbelly) and Perfume Point. Interesting to nore that many of these were caught on crayfish bait.
The snapper don't know where the car park is! Sometimes it is better to travel than to arrive.