This is frustrating. Taking a mold of your breasts like that will affect their shape, both with bouyancy and that she's leaning forwards. It would have been best to use silicon rubber or alginate. But since those are expensive, the best bet would have been to apply plaster bandages while she sits or stands upright.
Two- do not use plaster to make food castings. She took a biteof gelation but that jello tit 100% had bits of plaster stuck to it. And the pudding boobs sold online? Not food safe or delicious.
HARUMPH.