I fish the Purdy Spit on a regular basis and usually on an outgoing tide. Looking at my journals, I notice that I had barely hooked a fish if at all past a 12'oclock low tide. Now, my journal records are far and few between, so I am not saying my info is 100%. It seems that the fish, IMO, whether sea runs, kings or cohos bite agressively before that noon low tide and again, a few if at all after 12.
Here at the spit, for me, I dead drift with my spey rod and usually get most of my strikes 3/4 through the drift with no strip at all. I know fishing from a boat is quite different but the above is what I have found. Drop me a line if you want to fish this area, if you haven't already.
I have not tried poppers yet, maybe that will be determining factor???