Hi guys, as one of you suggested it, i will just post a few "developper" observations.
First, your quick comparison sounds great on both

But i really think that the difference you are hearing is mostly due to the "miking" and the percussion level.
On the VB3, the percussion is way louder and sticks out, and this is something that you can adjust in the B-5 (in the advanced preferences), you can even use the "paradise button" to have it sound like jimmy smith when he played on a broken B3 on a few albums.
The second big difference is the EQ, which is included in the way we recorded our impulse responses, this greatly depends on the room, the Leslie and the mics. I don't know how VB3 recorded theirs (or even if they use IRs) but it sounds like the mics were placed extremely close (to the point that there is no room ambience at all) when we prefer to still put them where a sound engineer would have put them to still get a little bit of ambience. But this is a matter of choice, and some will like a more "in your face" sound that you get with VB3 and some will prefer a "i'm in the room with the B3" sound for which the B-5 sounds (of course to my ears) best.
You also point out that the first three drawbars disappear, this is completely normal and was accurately (as you pointed out) reproduced from the B3 we had in our hands and is due to the foldback.
And regarding the fact that they lack "body", why don't you just increase their volume a bit? Sometimes it's just the relative volume that gives that impression.