That looks like a ton of fun and you are puttin the whoop-down right there. I'd love to get into them in a kayak once! Love the free jumpers in the video.
With that many fish I would be tempted to experiment with lighter gear- straight bait, spoon or plug like a Rapala or wiggle wart if they'd would dive deep enough and I'd nix the downrigger and flasher if at all possible.
Obviously you are doing it right and it is working.
All good points. I should have added that I did have a 6wt fly rod with straight mono I wanted to try. Day one was such a failure due to a late start, I had to hammer fish and get home (6 hour drive one way to Valdez) on day two.
I had the downrigger for two reasons. Light line fish the cohos deep. Second, was to practice the downrigger technique for the feeder king salmon we are fishing for currently. Those tend to be caught 40 to 80 ft down so you need the downriggers.
Here's another Valdez coho hammering video from two years ago. Everything but the flyrod on this one including my GLoomis 1-4 lbs rated ultralight. shorter at under 3 minutes total. No downriggers and only occasional flashers, and they definitely caught fish and it was MUCH more enjoyable.
Valdez cohos from a yak - 2011