Transparent Shader Render Order Issue

Using the stock Transparent -> Diffuse shader causes some backface rendering issues that I haven't had before, and I think it has to do with the fact that this time it's on a large number of complex models, so the z-order is more difficult to figure out.

Is there another shader that will let me fade objects in and out of "existence" without causing this issue? It'd make this anatomy demo look so much better if I can smoothly transition from skin layer to muscle layer to bone layer.