I'd say you're being a bit too aggressive. Playing aggressively is always more fun, but at the same time i think you need to restrain yourself a bit at times and let them approach you a little more. Shaeden seemed like a pretty solid falco actually, and while watching that set I know I would've made many of the same errors that you did. And as for your set against Vanz, I'd recommend not approaching almost at all when peach has a turnip. If peach plays it right there's really no way zelda can get in safely. Bait her and get her to throw the turnip, then stay close enough to her that she doesn't have enough time to pull out another one without getting kicked in the face. Obviously don't stay too close though because peach's nair is a *****.
For the people who think Uair is useless-- check out Zone's set against Shaeden at 2:07. Lake could've used an upair while falco was recovering. Shaeden probably would've CCed it so it wouldn't have done much, but extra damage is extra damage. The move isn't good, but it has it's uses.