I recall that thread, just couldn't recall that it was you.

You are close, but missing the vision somewhat. Referencing to 0.1gr is missing the point of volume, and really chasing weight.
There is a reference to weight, simply to have a starting point, but there isn't a direct tie to it, unless you are sure of the nominal BD, which we can't be.
Also cutting kernels doesn't matter, the relative geometry doesn't change appreciably.

You seem to be on a nice path, just work on consistency. Consistency will keep volume the same, don't fret over the weight wiggles.