I am starting a sourdough starter again since my old one "die" due to several problems. Anyway, I choose the "pineapple juice "formular of the "sourdo lady". It is now on it 8 days and doing poorly. On the 4 days it double and I was very excited that it is on its way to maturity. After that day it went down hill and now appear "puffy" but never rise! I religiously follow the instructions. What is wrong? I use rye flour which I just bought from the Natural foods store . Please, please help.