How many plants, what nutrients

From a fellow grower:

I grow with number 4 and cocoa ass my medium. I have to flower rooms now so I am only able to veg a month instead of two months as I used to. So I went from 15 gals to 7s. How many plants would u put under parabilics in order to ensure 1.5 per light? What nutrients? I’ve had best results with advanced nutrients still I’m only pulling a p a light. With 8 7 gals under. What nutes can accelerate my growth in veg. I just use fresh air 10" Max fans