That's interesting, my first response to >39% was the correct one, then by context misjudged it to mean fwd of . Mr Semantic-Pragmatic here, maybe it should be looked at - aft/fwd of are not big words, and then it's totally clear!
At the risk of extending a somewhat off-topic discussion, the fbw, however smart, is still working with a less stable machine, so presumably working harder, letting go sooner...
A secondary effect, of such a mass at such a distance, regardless of c.g. position, is an increased pitch and slightly increased yaw inertia. This likely has some +ve and some -ve aspects. One -ve would be higher rear fuse bending moments, which may well be small or insignificant in the whole scheme of things.