That sounds like a nice set up.
And I see your love and I also see your enjoyment of the tech/scientific end. Which I enjoy as well.
So this is some possibilities that I might throw at you.
It's hard to do this because of the amount of info out there, and forums, then personal input, and possibility friends.....can drive one crazy!!!!!
But I'll throw it out there for you anyway.
Fox farm not the greatest, I know it's part of the super soil recipe. If that's the one I'm thinking about from Sub.
Too hot. Won't bring out that deeper quality your looking for.
All the addatives might be working against you. Not saying I know this for sure, so no disrespect.
Sometimes some things just don't get along. They might seem like they might, but unless your mixing your mix and everything and taking that to a lab to see if all that doesn't lock each other out, or not work together properly, you might not be getting the most out of your soil.
Just saying it's hard to know.
So you might want to try a slightly cooler mix.
Neem oil can also impart a flavor orharharshness to the final product.