I used to fish a part of Brisbane river Brisbane and I was always surprised by the tide changes/anomiles. I could never get it exactly right, but I did work out a hole where the fish used to lay regardless of the variances. I believe the fish used to lay here because these tidal anomilies over many years had created a formation, structure and or a hole.
Maybe your spot might have a similar structure or formation caused by these strange tides. A honey hole just waiting to be discovered
A local to the area may give you part of the formula to assist with the prediction for example a westerly wind blowing at 25 knts for 3 days straight may affect your location.
I spoke to many people about these tides in the Brisbane river at this particular location and it wasn't until years after fishing the spot I happened across a guy that that gave a good explanation. The major factors at this location were the size of the tides, wind direction and strength, and rain fall.
Good luck