Slow for Chinook.
Fish DEEP if you're looking for feeders... as in 150-200.
If you want to try for mature chinook, fish as you normally would around Vancouver with Anchovies behind Flashers from 30-85 feet on the riggers. Offshore is fine too as you will be intercepting late Columbia and Fraser bound Chinooks. You may find a couple.
In the early 90's I recall a day trip I made over there with Dad in late July. We bagged a 27, 32 and 24 in medium Herring on 7' leaders behind Flashers...we were within 500' of the Rock starting to troll home.
I imagine there will be a glut of Humpies too. In the mid-nineties I recall being half way between Active Pass and Sandheads out in the middle with freighters going past literally shakin off Pinks on every lure we had down.