Man, I'm sorry but I just can't agree with slapping a limit of 10x or 20x boosts to Sage Mode users, because of something that was shown exactly only once. And no, it's not necessary to scale base forms from senjutsu boosts at all.
I said it's inconsistent because senjutsu has not shown to give the exact same boosts to the characters that use it, and neither was it stated or repeatedly backed up, which is what we'd need to accept something of this magnitude.
For example, according to you, if the Juubi becomes High 6-A, it'd scale to Sage Hashirama and Madara, right? And senjutsu cannot give more than a boost of 20x? If so, that'd be High 6-A base Madara? And what happens to Tsunade who could smash Madara and one of his Susanoo versions, and the Kage that can fight against some of them? High 6-A Gokage? Because Susanoo versions would still be stronger and more durable than base Madara.
It's just like we don't scale the base or Shikai forms of Shinigami to be 5-10x weaker than their Bankai, despite the fact that it was actually stated that Bankai multiplies their power more than 5-10 times. It creates so much inconsistencies. Yeah, I can't agree with this one. If others do, sure. But I'm not talking about this anymore, because I'm sure I can't be convinced. If you're still insistent, I guess you can make a thread later. For now, let's deal with the 8-A scaling and the MHS+ calc for the Deva Path (corrected Gywn version).
I also don't agree with the thing about BM Naruto harming the Juubi, because it was with Rasenshuriken, similarly to what happened against Kurama. And also the thing about BSM Naruto and Sasuke vs Juubito. This might have been addressed before, but why are they scaled that way when their attacks were imbued with senjutsu, which is Obito's weakness? I know that they had to use it, otherwise their ninjutsu would be nullified, but Gamakichi could mess up Obito's TSB shield, and Sage Mode Naruto's Rasengan harmed him.
There's also the contradictory thing about the notion that Sage Hashirama's twice as strong as BSM Naruto. Did the guy not admit that he wasn't a match for unstable Juubito? While Naruto actually did things against stable Juubito.
To be honest, the only thing that probably seems legit to me is Sage Hashirama restraining the Juubi, and the dude still said they had to combine together to combat it.