Beginners questions for an experienced grower.

Hey everyone i just started my first grow, I've got 2 plants (1 medical seeds : No name and 1 jungle wreck). I'm in soil with a 250w MH light. I'm now moving into my 4th week and have been watering 2-3 times a week ( generally when i cant find a moist spot 2-3 inches down).

I have been reading extensively but have found no information that i would call definitive to answer my following questions. I realize that trial and error for my own habitation may be what i have to do to acquire a fool proof methodology, but as a beginner i would very much appreciate anyone's tips or advice.

1. Has anyone got a good recipe for a solution to mist leaves? i have heard people talk about non-toxic sprays which help to fight mold and keep pests away but personally i'm looking for an aid to growth.

2.Has anyone ever experimented with a deep root trainer and what were the results they encountered.

3. With a lower strength light system what sort of height should i encounter come harvest if i start flowering at 12"? (I'm sorry if there is not enough information here to give a reasonable answer to this question. I am using Cellmax fertilizers; root booster, Soil grow mix and soil bloom mix.)

Avoid using foliar sprays on this plant as it doesn't seem to respond well.
No real need for deep root trainer.
Depends on how long you flower them. Another 6-12 inches perhaps?