Tin,
I only cast with vacuum and lost wax. This method will not work with ceramic molds because there is no way to pull a vacuum through the mold.
The stuff I have seen on utube with ceramic molds has a vent and riser system to fill the ceramic mold.
I think that a ceramic mold could be used with a centrifugal lost wax casting machine instead of the normal investment because the mold is filled by centrifugal force.
Dan