- When recovering, you seemed to be in a rush to get back on-stage and this left you open for a lot of attacks. Don't do that, wait until you can mf to the ledge or above stage without lag or aim the barrels so that you land on ground as soon as possible when you fly onto the stage.
- Another would be lack of momentum cancelling and habit of airdodging. This rly affects your recovery options, improve this and it's a 2 birds, 1 stone thing. Uhh first of all, if it's not snake, pit, falco, maybe mk, you trying to tech, you trying to avoid a stage hazard, or escape a combo/string, there's no reason why you should react to getting hit with an airdodge. Instead, choose where you're going to di and what move is best to momentum cancel with then work out a plan as you're recovering to maybe gimp your opponent or get on the ledge or stage safely.
- Then comes the common problem. Auto-piloting. You did this against mk when he was about to die and in the beginning of your second stock letting him make a comeback and taking advantage of it to take the lead. Same thing against JMIX's Mario on FD both matches, more specifically on his first stocks, first time you getting graped cuz he broke your momentum early, second time you get his 1st stock but he wouldn't let you get any momentum going when he returned, and tanked through your second or last stock(forgot already). You also tried it on his Luigi but couldn't cuz it's Luigi. Don't let yourself get too confident, try thinking a bit more before rushing in.
- Your biggest problem imo, too aggro and reckless. Again and again running into attacks. This I saw most against JMIX's Luigi. I'm guessing you got cocky with Fair and started spamming it cuz it beats or at least trade hits with all of Luigi's aerials and this cost you a bunchload of opportunities to ko or do something else that would've helped. Slow down, wait, think, or camp if you have to, but anything is better than repeatedly taking grapage.
I saw one of mk vs. diddy on ps1(1st one on the playlist) and the 4 matches against JMIX and listed what I think were the cons that influenced your diddy game more.
Posted this at 1 in the morning, lots of the post was graped by wiinet. Sleepy advice is meh. O_0