Great video - I've never understood why trout attack a chironomid - it's not like it's going to dart away like a minnow or a dragonfly nymph. I've always envisioned trout just cruising along and sucking them in - like a whale shark eating krill. But your video shows them attacking them!
Have you ever used 'action disks' in front of a fly? I've used them trolling leech imitations with some success, but have generally been unimpressed with them. I thought that their extra 'shiver' on a marabou/rabbit strip fly would get a lot more interest than they seem to trigger. It would be an interesting comparison with/without a wiggle disc - for your video!
https://www.wigglefin.com