My planting medium is simply dirt from my own yard, which is quite fertile due to plenty of volcanic content, and has nourished many plants, cannabis and others since we started growing things back in 2015. I think the big reason that cannister's dirt looked so meh was because I had watered the night before and the dirt was still damp and lightly muddy.
I am 99% certain that my fails are simply due to first and foremost, me taking on too many projects to manage at once, plus most all fails were not in the most optimal of spots for lighting, and then the couple additional cold snaps we have had after a week or two of Springlike weather. I do seem to recall S:02 being down in the living room here the night it failed, and I did turn off the main heater that night, and put the other on a single bank; and S:02 was not in one of the primo lighting spots.