You're doc is pretty darn good dude. On the whole inconsistency part, I know how you feel... I'm about the same skill level as you... you might be a little better actually but I'm working on my consistency, punish game, follow ups, and just straight up execution.
I really didn't see that much stupid stuff. The reasons why you were dieing was mostly because you took an unnecessary risk in situations that weren't favoring you... like in your last match, you lost your second stock because you were on the ledge at 110% and you needed to get back on stage and get that kill on puff... what you did was ledge hop into fair and that's a very risky move at that percent. You lost another stock in your second game by using a double jump that you didn't need to use. You weren't even off stage, you were above the stage and you could've just safely landed. There were definitely times where you threw out an unnecessary fair. I don't remember which match but in either match 1 or 2 you tried fairing puff when she was at 0% or low %. It's not going to kill, it's not going to combo, and it's risky. You should've done an up air or dair, something that you could combo into and build percent then go in for the kobe. I think the only reason why you were dieing was because you made a poor decision in a bad situation.
Also, when you're getting knocked off stage but close enough to where all you need to do is just grab or up b to grab, i feel like you lose double jump a lot when you don't need to. I see you like to protect yourself with pills and tbh i'd rather just go for ledge and save my dj. Doc's recovery is a resource management game. You got dj, up b, down b, cape, and air dodge. 3 of those, being dj, down b, and cape, are not coming back until you touch the stage and using any one of those 3 is a big deal. When you double jump to throw out a couple pills, you just lost 1/5 of your recovery options and it's not coming back. When you're that close to the stage I don't think it's a very good use. Now if you were way way off stage and you're going to use every single one of your recovery options and you need protection then go ahead and use it.
I can tell you love using fair because damn those were some of the best kobe kills i have ever seen. And duuuude... those pill to kobe kills... too good. But i think you need to use kobe less and use dsmash more, because there were some situations where all you had to do was dmash and puff would've died or at least would've gotten her to back off. I'd say dsmash is one of doc's best move, because it's fast, has decent range for doc, covers both the front and the back, it's recovery times isn't bad, and it's a pretty consistent kill move. Sometimes I'll just randomly throw out a dsmash and people will run into it. My motto for Doc: When in doubt, down smash.
Your spacing is good
your pills were good
and you knew when to go in for the kill
Those three things are the key to beating puff
Honestly you should have 2-0'd that puff
I'm not that good at talking about the puff match up and if you showed us a video of you playing against another character like marth or fox I could give you more feed back and don't be afraid to show us a set where you lost. Those are probably the best videos to get advice.
Good job man! Keep making Doc look like a boss!