1st Grow, Holy Grail Kush, DWC w/CO2

Starting week two, I'll keep the total day tally running cause that seems to be what I've seen in other diaries. Seems like I'm off to a slow start but I'm hoping to speed up growth by regulating the temp/RH and dialing in the VPD a little better. Seedling Wk 2 Day 8 Moved all seedlings into two rows towards outer edges of tray for more equal light and nutrient solution intake/uptake. Day 9 Mixed 1L of half strength nutrient solution and gave 500 ml to bottom of germ tray. Raised PPFD from 300 to 350 @ 4pm. All seedlings are now showing their second sets of "true leaves" and are 3 to 4 inches tall, except for a couple late bloomers. Day 10 I removed the humidity dome from the germ tray to attempt to control the temp and humidity with the tent exhaust fans. I raised the PPFD from 350 to 400 @ 2 pm. I directed the circulation fan air flow over the seedlings at 0.5 to 1 m/s. Also gave the other 500 ml nutrient solution to the bottom of the germ tray at 4 pm. Day 11 Snowy weather is causing slightly lower temps inside the house and tent. The seedlings appear to be growing broader leaves as opposed to taller stems now. Day 12 I raised the PPFD from 400 to 450 at 11 am. I washed out the germ solution tray and mixed 1 liter of 1/2 strength nutrient solution and gave 50 ml over the top of each cube. Day 13 I gave the other 400 ml nutrient solution to the top of the cubes at 7 am. Gonna have to re-arrange some plants due to crowding until I transplant to the bubble buckets. Day 14 I've begun watering daily, over the top of the cubes in the morning. The seedlings are broadening their leaves and growing longer roots more than they are growing tall, so I'm waiting to raise the PPFD. No research or advice behind that decision, just guesswork until I take the time to look into a better lighting increasement schedule.