What's the best way to get the dry oven parts out of the foam mold?

Castable Refractory is a sticky son-of-a-gun… and it really adheres to the foam molds. We’ve tried using every food-safe grease known to man (and even Crisco… Regular & Butter flavor), but nothing seems to quickly release the finished pieces like a small handsaw and a little elbow grease. It will probably take an 45 minutes to an hour to strip and clean all 5 pieces from the molds.