By shifting the mass you are actually making it more symmetric than a symmetric ball. Once a symmetric ball is drilled, it becomes asymmetric. The Alias drilled to be symmetric will get you if not to 0; very close to 0 on the Int. differential(mass bias). Would other asymmetric balls do the same? Not 100% of them, however even the ones that do, typically with the statistical weights, it would require a weight hole, thus making it asymmetric again.
Symmetric balls do typically slow down sooner asymmetric balls.