What are you feeding? We had the same problem. We would have 24 or so pinks and end up with half by the time they could be weaned. We switched to Mazuri and havnt had one eaten. Plus they are breeding so fast we have an overflow of ASFs it's crazy..... But never a bad thing.
Im feeding a mix of Mazuri and wildlife feed. Both are slightly above 15% protein. I tried blocks and they are so-so with them, Im thinking about looking at Ferret chow most have 35% protein. Of course staying away from the obvious ingredients.