I started a 5 gallon batch of honey mead from your receipe. I added yeast nutrient, yeast energizer, acid blend, yeast hulls and vintner's choice activator yeast # 4148 sweet mead. My starting S.G. 1.100 After 4 days it drop to 1.072. Temp. is 75. After 5 days the s.g. is still 1.072. There are no a...