I had a great Breeding 1.3 group going for my snakes that preferred mice, they had 4 litters each without issue, then after the fifth litter, they went crazy and killed two of the mothers and half the babies. Nothing changed with the setup, food, water, etc. Plenty of space and hides for them. Anyhow, I have a new group started and it was only a matter of a month before I got my first new litter. Just have some patience and nature should take its course.