About the crown position, pay attention to the post of BK and Stilty in the V vs V thread. I think it says all.
BK assembled loads of V2 and V3, we can safely conclude he knows his stuff. Now Stilty, producing movement adaptor rings. Im pretty sure he knows the tolerance.
So, it is same old story, best sub is gen sub. With WM9 v1/2/3 and PT socalled WM9 v1, all are still faulty by default but best rep subs to date. Just pick your poison.