The hitters are getting more bat speed, but that is simple physics since the bat of the same net weight with that weight moved inward absorbs less angular momentum to reach the same rotational velocity, or conversely, the same arm energy generates more bat velo, but that is tempered by the fact that the tapered bat doesn't actually have any more angular momentum than the regular bat moving at slower speed. I think that's why if this makes a difference, it must also depend somewhat on the spring in the bat. If the bat were completely rigid, I don't think moving the weight would matter, but of course the bat isn't rigid, and different bats have different rigidities. Elastic flex in the bat should add to exit velo and the torpedo shape actually may make the bat stiffer/less springy - there are a lot of possible variables! 🤷♂️