For your next batch combine aeration with your step nutrient additions.
Either give your fermenter a shake or stir before adding the nutrients, start slow with either, let it foam and calm down, then more vigourously until you are giving it a good mixing.
This will help add some oxygen which you want in the begining of primary fermentation as well as off gas the suspended CO2, both make the yeast happy. After doing this add your nutrients, I like adding just enough water to them to make a thin paste or thick slurry, it just seems to help mix it in easier. By doing the aeration first, you will prevent the mead geyser. Without aerating, as soon as you dump the nutrients in it create thousands of nucleation points and your mead spontaneously degasses all over you and the floor and the ceiling.