I currently grow soiless, but grew organic for 10 years. Here's the system that worked best for me:
Soil: Roots Organic and about 25% more perlit
Option: Fox Farm Ocean (cut with 30% coco cause it's pretty hot) and 25% perlite
Micro Nutes: Earthjuice Microblast
Calcium: Botanicare Ca
Magnesium and Sulfer: Botanicare Sweet Raw
NPK: It's up to you. I would use Botanicare Organic soil blend to be safe. But, top dress with High N bat guano in veg, and High P guano in bloom. For K use kelp in every feeding and/or Roots Organic makes aan organic liqued thats 0-4-5...good stuff. You might try fish early in veg cause it won't burn like guano will.