Strain plays alot to what you will get sativas are a long drawn out process taking up to 12 weeks of flower.Make sure you have your nute schedule right and the nitrogen has been replaced by the heavy phos feedings which induce the bud sites and flowering.Keep temps 80 or under in the room and air movement is very important as stagnant air will slow growth. The last 3-4 weeks of a strains flower cycle will add lots of weight and denseness.You can add things like cha ching, gravity ,sweet leaf, sweet,sugar daddy or in soil black strap molasses to fatten them up with resins. These in the pictures are just at 3 weeks 12/12 with 10 days veg under 600 watt lights.They will get the size of softballs in the next 2 weeks...