Note: I'm still a scrub, take with a grain of salt.
Putting this together as I watch:
One piece of advice I've heard others give is trying to spike DK with dair instead of fair as it's easier to not get hit by the side hit boxes of his up-b. I don't play many DKs so I can't really speak from experience but it kind of makes sense when watching your games. Also there were a few points where I wondered if maybe trying to spring gimp wouldn't have been more effective? But that fair that finished the second game! Holy %#&! that was sweet!
It seemed like by game 3 the DK had kind of figured out ground-pound as being super-effective at shutting down your approach. Seemed like maybe mixing up your dash in JC grab game with more short-hopped aerials might have been better at keeping him off balance?
Aaaaand watching game 4 clearly you had figured out both of those things. lol.
Not sure what to say about the Falcon matches. Seemed like there were a few missed edge guards but you seemed to have things pretty well in hand. And omg that wall jump to fair attempt at
https://youtu.be/ExzmptUtIgg?t=673 ! If that had connected that would have just made my night.
One question I have after watching those, I noticed that sometimes on recovering you'll wall jump before up-b'ing. Is this just to mix up your distance from the stage while rising to not be predictable or do you do it at specific times for some strategic reason? For some reason whenever I do it (usually by accident) I get the gut feeling that I've somehow just limited my options.
Another thing I noticed you doing that I really need to start incorporating into my game is dair on stage. How/where do you find this move useful?