I've always done better for silvers either up on Possession bar, or over near Mukilteo. That's a bit of a run from Shilshole, but it can be done. You might think about going in at Edmonds next time. I prefer to use some variant of herring, such as plug cut herring, herring behind a dodger, herring strip behind a hoochie and flasher, etc. I've also done well with J-plugs.

I start at 20 feet down at day break, and go deeper, to 60 or 75 feet. Look for the other boats, and watch where they go. There aren't a lot of secrets about this.