can't give you much till you upload videos, but to take any character to a tournament and expect to do well you need the following.
Knowledge of the match ups: It doesn't matter how well you react, consistent your tech skill is, or how well you combo if you don't know what works and what doesn't work. Once you understand the options that each character has in given situations, you'll be able to understand when people are playing their character and when people are playing you. And that leads into all that mindgame stuff people talk about.
Forethought: You need to know more than just character options, you need to be aware of what's going to happen after a character does something. Stay a step ahead of your opponent and you'll win the race, right? An instance to help that make any sense at all: You're on the edge of a platform with you're shield up, a falcon comes along and uairs you, hence knocking you off the platform, you fall off the platform from the momentum, and because you didn't realize you were going to fall, you don't wiggle out of the tumble animation and miss the tech. Falcon gets a free whatever-he-wants on you. Extremely small tidbits like that can completely turn the tide in a tournament setting. Not too mention, the shock of something small like that can easily throw off your concentration.
Mindset: Don't go into a match thinking "i'm going to win." or "i'm going to lose." winning or losing doesn't exist during the match. The only thing that's there is your opponent, you, and a stage. Not trying to be philosophical here, my point is: If you're thinking "I'm going to win" or "I'm going to lose" instead of "From his approach he's going to nair, i should bair" you're going to eat that nair.
Experience.
that's my thoughts at 4 am