First Grow: Gorilla Girl DWC with LEDs

Hi, NASATrainer here on my first grow. I wondered about harboring a plant for years and ordered seeds one hazy night. My seeds from Southern Oregon sprouted and now I'm committed to giving this plant my most tender loving care. My intentions are to research trichome formation on a Sativa leaning Gorilla Girl. I consider the GWE articles to be the Holy Growing Manual. After reading the top guides several times, here's what I'm going to attempt: Grow 1 plant in a 5 gallon DWC bucket under a 300W equivalent LED. The grow space will be limited to a 2' x 2.5' x 6.7' tent. Would've grown sooner if someone told me I could have 8 colas instead of 1. -NASATrainer Nebula's Manifold Method: https://www.growweedeasy.com/manifold Feeding Chart: https://www.growweedeasy.com/general-hydroponics-nutrients Day 1: Seed sprouted between wet paper method and Ziploc bag. My local nursery doesn't carry rockwool cubes so I transplanted to a small cup with soil. Day 3: Transplanted to 1.5" rockwool. Soaked cube in plain PHed water for 30 mins, lightly squeezed, then in some lightly nuted water. Day 4: Worried that the plant is growing tall. Day 6: Started noticing yellow discoloration on the new growth. I'm guessing it's either nutrient burn or light is too close at 2". Rockwool also started splitting. I transplanted to new rockwool with 1/4 the nutrients, in the process killed a little root growth. Also moved my bulb 4" away and doing 20/4 schedule instead of 24. Day 7: Eventful week for the plant, but it's still inching towards the light. Hope it stays alive.