I take it this is your first coco grow?
Forget about complicating things, start thinking about simplifying things.
Go with Canna Coco A+B, a flowering food of your choice, epsom salt, pH down, and a pot of magnesium lime or Maerl.
Fill the pots with a drainage layer of perlite or hydrotone. Fill the rest with coco coir and nothing else.
Keep the pH at 6.0 throughout the grow so the medium pH and the nutient pH are the same and nothing challenges the pH buffering capacity of the coco coir.
Start with a bloom food solution of 0.4 EC on top of the water's EC
, whenever you've planted a seedling, or repotted or need new roots. When you see the roots, switch to 0.4 EC of Canna Coco A+B, and follow the manufacturer's instructions from there.
If you want to read a book for inspiration, read:
The One Straw Revolution, by Masanobu Fukuoka
His question always is: how much less do I need to do? That really boils down plant growing to it's very essence.
If you want to switch to growing organically, check out:
True Living Organics, by The Rev (latest edition)
I use an adjusted version of that, focusing on feeding and protecting fungi.