Using GH products

I use the flora trio and calmag but I’ve been looking at other gh products like diamond nectar, armor Si and flourishes plus would that increase my yield and if so how much should I add my ppm right now is around 400 and I’m in week 4

Silica yes.
Grow medium?
PPM should be at 1/2 or lower of what feedchart says.
I use FP for Humic acid.