Indeed, and that is a very clever use for the wax. Seems like you might be able to reduce the loss of detail by having a warm mold, as long as it doesn't warp the mold.

Might also be fun to experiment with the opposite side: 3D print the mold and use it directly, then dip that in silicone to coat it and eliminate the artifacts that way. Plus then you could have the outer layer be a softer composition, like an overmolding, which might give an interesting feel.