What about your tub size? Do you use 32 qts or 40 something quarts? I have been discussing this with a friend and he is having issues with slugs that he most definitely should not be having. He does everything exactly how it should be done, all his females are perfect weight, not fat, not thin, and his girls in the 32 qt have had a few slugs and his girls in the 40 something qts have had perfect eggs. I also kept my girl in a 32qt and had too eggs end up being too weak and dying on me. They seemed to have underdeveloped veins that eventually faded away by day 23.

Just a theory, I don't know if anyone else has had issues with the 32qt and slugs.