They need to cure after they're made. My opinion on Curing Time...absolute dead minimum, 48 hours, set straight or hung, then bag after a 48-hour minimum. I try for 72 hours minimum. If you can cure longer, do.
Also, Hard/Saltwater plastic can get bent in the bag worse than Regular, and Regular can hold those irregularities worse than Soft. These imperfections can set-in even after a good cure, but a good, long cure will help prevent the worst of it. A little oil in the bag right before You bag baits will help them settle in, You just have to work them in. I use Scent Oil in the bag for this. I no longer cook scent in.