Susano'O may have as many tanking feats as you'd like, but Gentle Fist is something that destroys Chakra. Not to mention a V3 Susano'O has never blocked anything with the sheer blunt force of the Air Wall Palm. Has it?
Course Air Palm has no destructive feats, its only been used on living beings, not Chakra, and when used on living beings, it goes for the inside.
Pushes something back that is 20 times larger than a V3 Susano'O, something that went from the ground all the way to the sky, something that is far heavier than a Susano'O. Even if it didn't destroy it completely, it would get sent flying miles and miles away, like what happened with Pain and Naruto's Toads.
Something that destroys chakra? Factually, Its but hype, exaggeration, used by hyuuga fans just as many other fans of other exaggerations do. This one failed to prove itself canonically.
As far i am concerned juubi is chakra, the origin of chakra, chakra incarnate, but it didnt go in smokes.
The size estimation is not power estimation and totally unrelated to the hardness of susanoo.
You can brake and chop lots of wood but hardly do much to small steel ball.
Tsunade has raw power to lift and destroy something 20x bigger then her but only managed to brake rib cage.
SM FRS bad and mighty but failed vs raikage.
4 x Juubi TBBs blow up countries but failed against crimson barrier at the same time JJ Obito chakra arms tear it apart.
I am sorry you try to apply our world physics and sense to other dimension.
It doesnt work, we can only judge NV by its feats.