Alright here's what I have from the DK one
You need to work on your tech skill and play better people. By tech skill I mean, SHFFL, L cancels, fortresshogs, the works. Sure you can wavedash, but it wasn't really helping you there. Try not to do anything like claw when you're under him. I DO like the up - b from your shield, the shieldgrabs and all that. Try not using bair as a general approach, just because fair is so much better. Try to read him better, it seems that he ALWAYS recovers above the stage and doesn't go for sweet spots, also that he likes to shield a lot when you're coming down from the air. Use these to your advantage
The DK player was pretty weak, I mean when you come back from a death, you should be charging your punch or attacking, not taunting. Not to mention he didn't have SHFFLs down, did a lot of unnecessary full jumps and had a weak recovery. He just needs to learn a lot more about how to properly use the character (at least in competitive status)
Work on it baby