So I am wondering if the ph jumps when the nutrients are added? My soil grows when I was using FF Trio I had to add AN cal mag through flowering. I only backed off on the grow big slightly and I used AN big bud week 4 and overdrive week 7/8. With that said I have switched to down to earth dry amendments and I use at least two heaping tablespoons of pulverized lime powder with the dry amendments in 5 gallon fabric. I usually top dress with another heaping tablespoons of lime and spread it around and I still sometimes add a watering of AN cal mag around week 6/7 on a 10 week strain. My watering is just ph water to 6 When I was using liquid fertilizer I would start with almost saturated medium and add the liquid nutrients at the end to saturate the soil, just to runoff. The amount of nutrient absorption is much higher under the led vs hid.I used to use Hortilux 315 with UV bulbs. Now Hortilux extended spectrum, kind led with uv(never more than 75% and mostly at 50%) and a gml with a hlg uv bar. All at 12” inches. As much as many will contest the use of cal mag and lime it has been one factor that seems to help.