If it were me, I wouldn't use the black kow as the main ingredient, you want good quality potting soil for that. The b.k. you won't want to put in more than 20% or so. And ditch the vermiculite...in an organic grow, your soil will have plenty of organic material to hold moisture, the vermiculite can contribute to overwatering. Make sure you use lots of perlite - minimum 30%, I usually use closer to 50%.
You do know to dry and grind the egg shells, right? If you don't, they won't be of any benefit.
Other than that you sound pretty good.
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