Honestly I'm not sure what my issue was either as I had quite a few things going wrong at once lol. My rezs were smelling like a fish tank, my humidity was too low for my Temps, and lights were too close. My soil seemed to be too hot initially as well. I have since got my temp and humidity stable and lined up with proper VPD, raised my lights, and stopped using LABs in my rezs. I also did some foliar epsom sprays all at the same time. I never decreased my amount of topdressings just stuck with Build a Soils recommended schedule and they pulled thru right before I switched to flower. They are doing wonderful now however.
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This was at about 10 days from the flip and they exploded with growth.
The faint yellow between the veins looks like it may need a lil mag but ik no expert on deficiencies yet. What's your Temps/humidity and feeding like? What kinda water are you using to fill the rez?