I can't say much since you play differently with no lag, but the reason I landed all those combos is because there's a window after Doc sh bairs and MK being fast allows me to catch you in time with dash attack. I also read what u were doing , whenever I was in mid range you spot dodged. It worked since you landed d smash, up b and utilt on me but later in the games we played I literally jumped onto you with tornado.
Also don't use down b so early since I was mainly waiting for you to use it so I can gimp u, In neutral you threw out pills and I simply stayed in the air because doc can't jump high at all I would've carried on but there's no clock. I think I got a down b punish when you threw it out. If I don't find an opening I tend to runaway a little like I did in palutinas temple FD, you got impatient and chased me.
Down throw to shuttle loop can't be DId until 80% but to throw off the MK users input DI up and away. But alot of MKs don't go for this because they haven't clicked on that safe and most damaging combos are better than stylish sword sound effects combos that deal 7%.
MU wise Doc loses imo 60:40 @
TTTTTsd can help you with what you can do with doc against MK.
Hope I helped a little ggs.