Germ from wet paper towel to the first peek of a root took 2 days. Soiled it right away. The soil Im using is ready to go with nutrients NPK 13 7 14 so I think there is no need to add nutrients before flowering time.
Good growing to you, buddy!
I'd dim the lights to about 100W with this distance, or with 300W going, I would try 1m height, working my way down. 😉
It's hard to do LST if the stems are super sturdy and short.