As you said yourself, you should be resting more. I watched the first, second, and part of the third one, and I did see plenty of oppurtunities you could have taken.
Otherwise, I noticed you get punished a lot for using Pound both as a recovery option and an attack. You might want to look into using Pound more sparingly. If you're close to it, grabbing the ledge is an infinitely better option than pounding onto stage.
You might also want to work on your positioning. A lot of your deaths looked like it just came from you being in the wrong place at the wrong time.
And if I am to nitpick even more, you could be more ballsy with your edgeguards. Puff is Puff, and can afford to fly far off stage to wreck some serious business.