I've been using dry amendments from Gia Green, their 4-4-4 All Purpose and their 2-8-4 Bloom nutrients. I've been copying what a guy on Youtube does "Mr. Canucks Grow". I've started throwing in a compost tea here and there as well as adding a lot of perlite and some dolomite lime. My most recent grow journals for my Shark Shock and Mango Haze coco grows both describe exactly what I did pretty in depth!!
For USA people Gia Green might be hard to find. I would guess the Earth Dust that "The Green Sunshine Company" sells on their website is pretty similar! They're the company I got my Electric Sky 300 V3 from, they seem to know what they're doing