well...you were kinda being too aggressive and jumping around too much vs. sheik, but you won anyway
he should probably have spent more time waiting for you to miss fullhopped aerials and fairing you.
the same problem came up vs. falcon but he's a better character at punishing that. either you didn't approach falcon far enough in, and he dash danced and punished you, or you tried to cover an aerial space near you which falcons really don't jump into, and got punished for that too. to put it another way...you were being too vertical and not horizontal enough. falcon is so fast, there's no need for him to jump at you recklessly when he can just run around and wait for something better to come up. you have to follow him around so he won't have the space he wants to run. [this whole paragraph can pretty much be summarized as "spacing"]
also falcon wants to get below you so he can upair and stuff. so don't jump up so high. full hop is kinda bad against falcon.
more generally, don't be so hasty with rests, you keep going for them assuming it'll work, but jiggs has enough time after a hit to tell if rest will actually combo or not. i mean, still react quickly, but REACT, don't just rest the place you think they're going to go.
the ones you got that seemed really sudden were good
but, it's funny, usually when jigglypuffs can get surprising rests like that they also have the above problem.
http://www.youtube.com/watch?v=2kd2RfRYoXg&t=4m9s this was a free rest, no one ever hits that tech.
http://www.youtube.com/watch?v=2kd2RfRYoXg&t=5m46s this too, super obvious roll. and
http://www.youtube.com/watch?v=2kd2RfRYoXg&t=6m14s.
edit:
- it's usually best to dthrow falcon
- *don't pound so much* i know it's tempting, but it's so punishable...and even though it was working against this guy it's pretty much unnecessary to use against falcon
- edgeguarding...hold the edge more often...get up from it faster against sheik
- against both CROUCH MORE. crouch > shield against both sheik and falcon
i know these are little additions but the pounding and crouching things are very important, lol