Theres sooo many different products out there that are made for what you want , they have a very very wide variety of nutrients that help in this manner . I prefer advanced nutrients you tend to have a little more control over your grow with that line up , but you could use products like b52 , bud candy , bud ignitor, big bud and over drive . When these products or similar products are used in combination they do wounders to your buds and yield . Of course we cant forget about our basics either to have the right light right temps and a good medium these 3 things are far more important then nutrients . You're also just beggining the stretch phase of your plant flower cycle she will get tall in order to make space to form flowers ! If your still not satisfied with this after you harvest then you could always search for additives in order to help make it easier for you