I make a soil for my outdoor grow in large 15gal pots. I keep it for 2 seasons and amend it with worm castings and other organic ingredients. Then i dump it in my veggie beds. For indoor i buy a good bagged soil like fox farms or dr. earth and mix it with perilite and worm castings which lasts for about a month when i transplant my seedlings into fabric pots. I had gnats 1x not a big deal and i don't get bugs from soil. Outdoor is a different story.
You need to just learn how to care for plants, learn that a small plastic pot does more harm than good and transplant them. You never show the full tent picture with your fans or humidifier or other gadgets you seem to have sooo many struggles. It's a waste what you started with so many plants i don't get it nor does any other grower who talks to you.
Folks here and on the other grow sites you talk too have all said the same thing. I visit other sites to learn about strains or training plants. I started 10yrs ago indoors with 2 photoperiods and nothing but a tent and a light and a fan. And i still grow the same way cause i learned and listened to the experts. Yes i feed my plants with NPK and bloom nutes when they need it.
Everyone develops there own way to grow but the goal is to grow great medicine not dieing unhealthy plants with costs of seeds, soil, food, electricity now adays. I grow big plants during summer, i share with others who can't grow. And yes some supersoils can do it all with just watering.