I can tell you why Nana does what she does, but the only remedy for these things is practice. x.x
@Part in red: I'm assuming that you're shield buffering (just due to the last sentence highlighted) though what I think it is doesn't really change either way. You may be pressing the grab button too early. There's a certain time after dropping your shield and after whiffing a grab where the grab button acts as a shield button, if that happens and you're inputting a direction then Nana will roll.
@Part in blue: I'm assuming the throw is softturned due to the nature of this happening. This happens due to the flip mechanics, when you do a back throw as popo, at the minimum (may be moredepending on character weight and if you're holding the control stick in the throw direction after it's registered) nana changes direction three times. She'll turn the way you input the control stick at first, but right afterward she'll flip back towards the position before you began the throw, that's because at that point the game recognizes Popo as still facing the direction you were facing before you started the bthrow, once Popo's arm reaches the arc of the throw, the game will then recognize Popo as have finally changed direction and then Nana will flip again to the direction that you want her to grab. You'll just have to get accustomed to the timing associated with Nana's last flip for each character during the throw.
So uhh... practice o. o
You just became one of my favorite people in the world
Thank you so much for going into so much detail. That makes sense, also thank you for the organization of your post as it helped to really understand exactly what you were saying.
The only thing I noticed, and I'm not sure if it changes anything, but I don't use a grab button, it's not even mapped on my control scheme, I grab with Shield + Attack, but I would probably still roll with my timing I think.
Since I'm here I'd also like to ask another question, what do y'all think is the most efficient/easiest to maintain chain grab on DK, on Ness, and on Lucario?
Against Lucario I like to Popo down throw with a Nana spike, with ice blocks when needed, and at 100% back throw to Nana and charge up smash.
Against Ness I like to forward throw to the edge and then Nana spike off stage.
Against DK I like back throw to Nana forward throw to Popo and repeat.
And finally, is it possible to consistently hit DK with the Nana spike out of down throw? Every time I try (with two exceptions in the last two days) she just sends him flying forward.
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