i wouldn't use those nutrients ever. we go all organic like Blue Mountain Organics, or at least use fox farm or something decent. MG is the cheapest and probably the harshest stuff you can use.
lighting is what helps your buds grow tight, along with good soil and the right balance of nutrients...not too much and not too little...but just right. keep the heat down and the humidity right. its a process and technique, not a race or to see who can do whatever.