SS didn't catch any because Madara combined the offensive power of Susano'o with the Bijuudamas,
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that essentially had both focused cutting power and raw "grunt". And besides, the potency of 100% Kurama is going to be above 50% Kurama + Naruto's simply because Naruto's own chakra whilst in abundance, was never touted as particularly strong.
Besides, Naruto's max output of Bijuudamas is around 4-5 in one sitting (by feats), whereas Madara was shooting them off by the truckload and still didn't manage to overcome it.
lol, the bold part already proved the significance of my sig.
Now you are misinterpreted my post here.
Now 100%kyuubi>>>>50% kyuubi, bm naruto, and BSM naruto in potential power.
However, a jinchuuriki less bijuu cannot control it's power properly hence why it is labelled weak.
That's the first part.
Second part is the difference in power the kyuubi can use.
Madara shot a weak ttb, a ttb the size of the kyuubi's mouth.
A ttb with that size and power doesn't even compete with the ttb naruto has thrown.
Even the ttb Obito shot out as a kid, was bigger than the ttb Madara used as well.
It took up more than the kyuubi's upper torso from what I remember.
Now compare this...
Madara's ttb Susanoo sword destroyed one mountain.
The same goes for the jinchuuriki bijuus, they all destroyed one mountain.
Doesn't make sense right?
The kyuubi's the strongest, how did it not destroy more mountains especially with Iso Susanoo sword combined?
It's because Madara traded in penetration power with more ttb fire power.
Susanoo and kyuubi takes up too much chakra, while being a jinchuuriki doesn't because it is more controlled and gathered carefully.
That ttb BSM naruto shot at JJ Obito was weaker than bm naruto's flash ttb, yet BSM naruto is stronger though.
It's the amount of chakra that is gathered into it that matters.