practice it, so i dont do it right all the time. Its no big deal, im still fine.
That's not the kind of attitude that's going to advance Samus' metagame! You shouldn't settler for "fine'.
Based on tournament placings, it's incontestable that you're the best Samus. Even so - and I say this with the most constructive intent - you have lots to work on. Re-tethering and re-grabbing with an upB are ridiculously easy - they can be mastered with few minutes of practice. Even in those Falcon matches (great, by the way), there were a few instances where I thought "Xyro, retether!!". You could have got a few easy KOs. Momentum canceling isn't something to take lightly either - it's not unrealistic to be living 10+% higher just by pressing the right button when you get hit. It makes a big difference, and takes minimal practice. Reflex isn't so great with PT by choosing not to learn certain things.
Speaking of little details that make a difference, angling your Fsmash up (at least against Falcon) would be add up a few extra %. The forward and down smashes are probably ok at higher damages simply to get the opponent off the edge in a position where they can be gimped. Also, there were quite a few instances where Falcon was just over a jab length away- you guys were both playing the spacing game with jabs (ex. 7:03). The ftilt would have to be a better option in these situations. Of course it's too slow to be viable when you're in jab range, but it does a good job at keeping him outside of that area.
Anyway, I don't mean to criticize you (or your Samus ^_^) personally. You're obviously better than I am. I just want to help Samus do better than she's doing right now - which she does have the potential to do.
I also have one general tip that I think could be of (at least some) benefit to most Samus players. Learn to buffer a reversed dtilt after a autocancelled aerial. I've seen many instances watching various Samus videos where there's a great opportunity for a dtilt after an aerial (very often dair or uair), but the Samus is facing the wrong direction and doesn't accomplish anything.
By the way, 2:46, that Fair -> pivot grab -> Bthrow into a missile you shot earlier was pretty ridiculously epic. You read him with perfection.