I have 9 clones of St. Therése in the window. I just keep them until I have space to flower them.
I won a Vipar 300 for $57 at ebay. As soon as I move into a new permanent home, I'll buy a large tent and one more lamp. A Mars Hydro I suppose. Seems like Mars has the best red spectrum.
What is your mineral supplements in your system? Is it enough Mg2+? Fe2+ and Ca2+?
I don't know much practical horticulture. I feed according to my learning in biochemistry and that is quite successful strategy. GH Urtica is excellent and I recommend it to everyone. I can see its effect with my own blue eyes.