I am making molded bunnies for Easter and I am finding that the necks are cracking and the head breaks away from the body. I have noticed that the neck is not as thick as the rest of the bunny. Total grams for this bunny is 200. Does anyone have any suggestions on how to rectify this? Oh yeah I didn't mention that after pouring into molds I place in the refridgerator. Any suggestions are welcome! Cheers Mary - Rookie