First off, I gotta say hungrybox, i really enjoy watching your matches. The spacing, decision making, rest set-ups are all awesome to watch. While I wasn't happy with the GF, I know it wasn't your fault (and neither was it Armada's fault) but I really hope you figure out something to do against it. I'm of the opinion that Jigglypuff can win that match up, but it's clear to me that out-camping YL isn't the best strategy, mostly due to YL's projectile game.
While I know Jigglypuff doesn't have an aggressive style by nature, I think you can adapt an aggressive style in this match up that can work. There's only so much space YL can work with to use those projectiles...it might be worth messing around with. Plus, although pretty irrelevant imo, it would be a much more "fun" set to watch.
And Peach vs. Jigglypuff isn't unwinnable for Peach, just ask DoH. Just as I think Hbox can figure out what to do against Armada's YL with Jigglypuff, I think Armada can figure out what to do against Hbox's Jigglypuff with Peach, if the YL match up becomes too tough to deal with.
Just my two cents, IMO.