Yeah, I usually follow first hit of nair with utilt - below your opponent is usually the best position to be in. I want to try following it up with fsmash though, apparently that's possible.
A bit late on this, I reckon, but I can confirm NAir to FSmash works on middleweights from ~70% and on fast fallers and heavies from ~115%. Any earlier and it can be either shielded or countered with fast aerials.
So, recently I've been struggling a lot at punishing characters with good aerial games, which I separate into:
Aggresives, or characters with good to decent aerial mobility, coupled with low-lag or hard to punish aerials (for example: Ike, Mario, Roy, Ryu), and...
Gimmickys, which have some kind of extra movement option midair that allows them to escape disadvantage with ease, these specifically being multi-jumpers (Kirby and Jiggs, especially), Peach(gliding), and ZSS(flip).
My questions are:
vs. Aggresives, what is Lucina's most safe and reliable move to relieve their aerial pressure? Shieldgrabs are complicated due to how easily they can land on either side of you or the landing lag/shieldstun ratio being in their favor, and UTilt is too much of a commitment, imo.
vs. Gimmickys, I often get baited into commiting too much, as multi-jumpers have practically like 4 attempts at an advantageous 50/50 that leads to another lose-or-lose 50/50 upon my loss at the first one, Peach has FAir to punish my slightest mistake when dealing with her gliding shenanigans, and ZSS's Flip Kick is just absurdly hard to punish in general. Should I just let them be, or is there some way in which I can retaliate?
I know these aren't easy questions, and I probably didn't make my point clear enough, so any help is deeply appreciated.