Sounds like you are doing what you can for the pasty butt. I noticed that some breeds had it worse than others and of course some breeds had no pasty butt at all. Some were so bad they required putting their bottoms in running water while I gently cleaned them and I also Vaselined them. That helped a lot. Why are some breeds more prone to it than others? I ACV'd from day one, grit on day 3 like suggested from Mcmurray. Not really sure what else can be done. Good luck with your next batch of babies. Hope things go better this time around.