Okay but the benefit of avoiding shakers would fall on mostly on Chinook rather than coho.

Recall that coho only have two age classes in the ocean. The youngest age class would have entered the ocean this past spring (March-April 2017). The older age class would have entered the ocean the same time the previous year (March-April 2016). There are no other age classes of coho in the ocean. After they spend their second summer in saltwater, they head back to freshwater to spawn. So all spawning coho are three-years old (gravel to gravel). They spend 1.5 years (18 months) in freshwater and 1.5 years in the ocean.

So there is only one age-class for coho harvest in the ocean fishery in the summer and early fall. The younger age class would only be about 8-10 inches in length. They’ll still be eating zooplankton and small shrimp. The older age class would be feeding on herring, anchovy, sand lance, and squid. That’s why anglers use cut-herring, spoons, and hoochies in saltwater.

Chinook are different. There may be multiple age classes in the ocean since they mature at various ages including 2, 3, 4, 5, and 6 years in the salt. That is where the benefit of avoiding shakers would be most apparent since these fish would continue to feed and grow in the ocean, perhaps for several years.

If you want to use larger lures to attract larger coho, that’s great. But any coho big enough to hit a lure (of any size) will be spawning in the next month or two. Those coho won't be there next year.