I've been making a mead for last two years, and a huge supporter of staggered nutrients additions to mead where you use Go-Ferm to rehydrate the yeast, adjust pH level with potassium carbonate, and some pectin enzymes with fruit additions.
Also, I'm using Fermaid-K and DAP on days 2-4-6 when the yeasts are strong and healthy enough.
I've been reading that a new trend is substituting Fermaid-K for Fermaid-O (O for organic).
I'm not quite sure how much Fermaid-O should I use per gallon. Since it doesn't contain any DAP in it, amount of DAP should increase, but buy how much? How much of DAP should I add on days 2-4-6 per gallon? Since there is no DAP in Fermaid-O it can be added all at once on day 0... What's the appropriate amount?
Oh, and the main question, is it worth it substituting Fermaid-O for Fermaid-K at all?