I know this is old.....but other than seedlings in 1 gallon which is straight FFOF w/perlite and EWC, any time I transplant still using FFOF, I always go ~20% perlite, couple cups of worm castings, and whatever stage I'm at I either add all purpose 444 all purpose or 284 bloom, or a combination of them. I just don't feel it's hot soil, or maybe I like to push it harder than most. Never have to topdress, from 1 gallon to 3 gallon to 7 gallon. Cal mag here n there when I feel like it. PH your water, AIR CIRCULATION. Got a decent light you're good. To me, nothing as important as good air circulation (meaning proper temps, humidity, air flow, fans, etc). What's most important for humans???? Food , water, or AIR??? Same with plants #1 air, #2 water, #3 Food. THEN the light is what pulls all these things together.