Hi Bruce,
I grew up in St Lawrence and know the area pretty well. I still have a place 20 mins up the road at Clairview.
The tides are massive there. 4.5m is a small tide. You can only get your boat in at about 1/2 tide and you wanna get it out by 1/2 tide as well. In saying that I enjoy fishing the holes at low tide.
I think the crabbing and fishing is awesome most of the time I love getting up there when ever I can.
Send me a pm if you want any more info I could go on about this place for hours lol.
Cheers Brett