There can be many variables.
Genetics,
Temps,
PH, looking at the "soil" you're using, it looks like mulch which can raise your ph slightly.
Lighting, usually from too much. Not your case.
And watering.
To answer other questions I read over your diary. Yes. The lights your using will work. But expect slow growth and issues with overwatering because the light isn't evaporating enough water and the roots aren't growing well. Yes, Too early to fertilize. Cannabis seeds have enough nutrients for the first week. I'd look into cheap led lights on Amazon. Yes. You will pay 50$ 75$. But its worth it. Won't regret it! Good luck. If you have any more questions. Ask away.