I was reading Greweling's Chocolates and Confections and he says that when molding bonbons you may need to allow the chocolate to sit in the mold anywhere from 2-5 minutes before inverting in order to produce desired and thickness and for the shell to be thick enough for the chocolate to contract from the mold, but in all of the videos I see, the chocolatiers invert the molds right away. Is this because the chocolate has sufficient viscosity and doesn't need to sit in the mold?
I have found that with the chocolate I use (Guittard 72%), if I invert the mold right away, the chocolate really doesn't contract enough but if I leave it for 3 minutes I don't have any problems. I'm just trying to understand the theory behind letting the chocolate sit in the mold, why I never see this technique in videos, and how you get thin shells to contract sufficiently from the molds. Thanks!!