Monado Master
Smash Journeyman
I'm not sure if I have another Wii U game that needs Synched Internet...Bayo 2 maybe? Idk.Maybe try your internet against a game where your game needs to be synchonised. In Smash, if one player has a slow internet connection, it slows both down so that you're fighting and reacting at the same point. Mario Kart on the other hand, only really lags you. Everyone else is still driving at their own pace. If your internet is slow it makes items a bit of a pain but it doesn't affect others. So maybe try a game that is closer to Smash? Don't know if it'll reveal anything. Just a suggestion.
As for FF uair, I've been trying it a bit but it's only ever paid off once (against ZSS) which went into a fsmash to win the match. I need to use it very sparingly, or need to get better at it. It's pretty precise.
So. People are trying to use FF Uair a bit. That's good enough for me to do some more testing on it. I'd be decent practice too. Which is great because during the summer I'm official getting into the tourney Smash 4 scene. But yea. It is pretty precise, especially on thinner characters like ZZS and Rosa (You'd still hit that friggin' Luma though). Anyone can name a character name a character and I'd do some testing. So don't hold back.
Also I found this video showing off the Monado's true power.
https://www.youtube.com/watch?v=wyCtT1i8Tok&index=9&list=PLP0p0098-cvyMbYZFBSCMzj1PFJUdJKE7