You've got the basic technical stuff down: your shffl timing is great, and you can WD when you want to do it, you just don't use it in combat (that takes some practice. WDing is something tough to apply when you first try to).
Like the_air_up_there7 said, you need to learn to SHL. You didn't use your laser at all that game, and it's your best move (yes, I and many other Falcos agree that it's better then his shine). Watch that match again, and pay attention to any time you dashed towards your opponent; all of them should have been advancing SHL (well, obviously, you won't SHL approach EVERY time, but you deffinitly want it to be your main approach. Even if your opponent knows it's comming, it's very hard to get around if done properly).
I think once you learn to SHL (and I mean fast and well), your game will improve 700 billion fold. Seriously. That's what you should be focusing on right now. You've got potential, but without the SHL, you're only a fraction of what you could be.