I've never fished the Vedder and avoid combat fishing situations, so the following comment may be really off base. I realize these are hatchery coho and, by definition, they are there to be harvested but if there are more fisherman than fish-producing spots and you've already filled your freezer, I'd think you'd either take your foot off the gas by fishing more remote spots (fewer fish perhaps, but better quality angling experience: no centerbeaks) or perhaps reducing your expected take each time out to minimize the potential irritation brought on by crowding.
You are clearly a top gun who has landed a lot of coho in your time, so leaving a few in the river for the other guys is also an option, isn't it?