dnt over do it, fimming will slow the vertical growth of whatever branch you did it to. although it should only really be done with your main top. Cannibis grows up and the main top is always doninant, when u Fim your main top, it slows the growth of that area, because is has to grow back to normal. During the approximate week it takes the top to start growing normal, the side branching grow out much faster, my best guess, is the plant is trying to make up for lack if growth on the top. just dont go fimming any branch you want, In hopes of upping your yield,