I wish I had the patience & drive to mix, bake and utilize my own super soil.SIMPLE is my approach. Build a soil, let it ”cook” for 3 month, and water only with a 50/50 mix of rainwater/tap water at 6.4ph. My tap water is 180-200ppm, so I am diluting to 100-120 ppms. I’m NOT looking to grow big plants, but rather happy plants. As a friend once said, “I want to grow quality/happy plants, bigger is a bonus”.
Looks like you’re on the right track man! Can honestly say I never worried about ppm in my soil grows but now having transitioned to hydro, really wish I would’ve.