I also did a bit of research into organic dry amendments for autoflower but it’s a fine line because when they are young seedlings they can still be easily burned and stunted and even if ya top dress after the first two weeks , by the time the nutrients start to break down the plant is growing like mad and it may get to hungry because their is not enough available nutrients for the plants. So I decided to stick with decent synthetic nutrients as I was not confident enough to go the other way, maybe one day. The only thing different I will be doing in the next grow is adding more pearlite to my light mix and mixing in some great white, fastbuds zkittles is my next grow , I will be starting it in the next 2 weeks.
I haven't given up on dry time release organic nutes, yet. One strategy is to only add the time release nutes to the soil in the bottom 1/3 of the pot. Theoretically the young plant's root mass initially is surrounded by just soil, and then as it grows it's roots expand into the hotter/richer soil. Then top feed carefully, it usually only takes one additional feeding at the start of flower.
I'm playing around with adapting SIP trench strategies, but I've recently learned the limitations. The concept is that you put concentrated "trenches" of nutes in the soil, and light feeders avoid them and heavy feeders tap into them, and there is enough there to last the duration of the grow. The limitation is that... well, it's far from optimal.
Best case scenario is what you are doing -- providing light balanced nutrients to the entire root mass consistently.
I'm sort of limited by my fixation on attempting to reach as close as I can get to a "just add water" grow paradigm. It worked with SIPs, and it can work with well built organic living soil, might or might not be possible with what I'm doing. I'm also attempting to find one grow strategy/system that works for the widest variety of strains, regardless of whether they are light or heavy feeders, since I'm always growing multiple strains at the same time. So, I guess I'm willing to sacrifice optimal production for universal simplicity. Or something like that.
BTW, if anyone is reading this, don't follow my example!!! LOL, these are experiments that haven't killed the plants yet, but are definitely not optimal.
Can you dial your exhaust fan down?
No, its a 6" inline from when I used to have a bigger grow space, it's on its lowest setting.
EDIT: My using dry time release nutes is a holdover from my having started with photoperiod's, and I'm still on the steep part of the learning curve in terms of figuring the differences between growing photos and autos.
Always nice to find a silver lining. 
