Oye, I have an idea, but it follows after the questions:
What is the biggest problem with Falcon right now, gamewise?
-Dealing damage?
-Avoiding damage?
-Dealing finishing hits?
If it's dealing damage, maybe you have to play a little more patiently, or find the right moves for the right situations. Maybe you're trying to do a combo/juggle but aren't taking time to plan for a "what if he dodges?" situation. Maybe you're trying to push your attack on someone else's attacks and just being outprioritized all the time.
If it's avoiding damage, well, I can't really say much about that. At least you're not too large of a target, and you can get away >_>
If it's landing finishing hits, and NOT the other two, then I have a suggestion.
Play them to a high damage.
While playing Sonic (after switching from Ike and Ganondorf LOL), I felt that it was dismal to not be able to KO at 100%, or 120% (in most cases). The moves that killed at 120% were kinda hard to get the position for. Heck, I got a Bowser to 200% while keeping under 100%.
Don't get hung up on that.
Keep pushing their damage, and eventually, more moves becomes kill moves. And who knows, while your opponent is waiting for weaker, lower knockback attacks, you can finish them (hopefully earlier, and not having to take an opponent to 230% just to throw him off the top of the level, like I did).