True, v1 is in fact faster.
I have doubts over whether it can really blow it away without making contact. The Susano is apparently nigh immovable. It protects its user from pressure which would in turn move him to the location he's being 'sent'. However, the Susano sticks to where the user's body is, thus only the top part begins to move slightly, while the bottom part remains with the users body. It can be inferred in the fight with Danzo, as Baku attempted to suck him in [
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]. Though if the tails touch him he would go flying, but that would mean he's in totsuka's range. I could be wrong about this, but it seems plausible.
Nah, Itachi can go v3 and stab quicker than Bee can go BM and fire TBB. His v2-v3 formation was fast enough to nullify Kirin. I doubt Bee's is quick enough for that.