Critical in new custom soil recipe

This week I started a new grow in my small grow tent with a new custom living soil recipe. The seeds were sown directly into the soil and germinated after three days. Domes weren't used for germination. Right after germination, each of the ladies received a dose of water-soluable mykorrhiza (solved in 25 ml water per plant). The current leaf surface temperatur is 26°C (~79°F), I'm targeting a VPD of 0.8 kPa and thus RH of ~75%. The lights are at a distance of 30 cm (~ 12 inch), dimmed to 250 PPFD and are running 18 hours/day, resulting in ~ 16 DLI. The soil is an own mix consiting of wormcastings, coco, perlite, chalk, gypsum, kelp, neem, corn and basalt. I usually use pumice instead of perlite but was empty on this. For P, I usually use soft rock phosphate. This time however I used superphosphate to do an earth test to see if this has an impact on my microbes. Why using superphosphate and coco in an organix living soil recipe you might ask? That's simple - I'm a hippie-dippie vegan dude who doesn't wan't to use peat (sustainability and stuff) or animal slaughter house wastes. Thus, I try to come up with my own recipes to avoid that stuff.