On the label of Fermaid K, for example, it says to add a specified amount at 1/3 sugar depletion. Since some of my fermentations following this protocol have ended sluggishly, with rotten egg, I wonder about this. Say I have a high gravity wine that should ferment to 13%ABV. Then contrast that with a lower gravity beer that will end at 6%. Should I not add more nutrient in the case of the high gravity wine? Yet the instructions give a certain amount with no indication that it is dependent on ultimate ABV. I have had to add extra nutrient toward the end of a high gravity fermentation, to try to mitigate the rotten egg, and it seemed to help. But really, I was just shooting in the dark, with no idea how much more nutrient I should have been adding. Is there some rule of thumb to correlate the amount of DAP-based nutrients, or complex nutrients such as Fermaid K one should add based on current gravity?