Rosenthal says the top two things determining the quality of the bud are 1. genetics and 2. when you harvest (trichomes).
I re-did my grow room over the summer and basically stopped using it as a library, took out a buncha books and now stow all my grow stuff on the bookshelves. I looked for a cheaper way to cool the small grow box reservoir, but ended up with another Active Aqua 1/10 HP chiller. I hope and pray that I am now achieving a stable hydroponic growth environment and that all the drama I've had with roots will be a thing of the past. That is what I am hoping. Really, in that case, the only thing that will worry me is the extreme weather in the Southeast and loss of power (was out for a week last year after hurricane Matthew).
I also use a bunch of beneficial bacteria. It's probably overkill, and eventually I'm going to have to do the research to figure out what I don't really need to buy, but on these 2 current grows, I'm using Voodoo Juice, Tarantula and Microbial Munch by AN, Hydroguard and Great White. I have a morbid fear and loathing of root rot.