I agree with the lights. But you can get some good inexpensive nutes for flowering that does make ur buds(colas) fatten up once they are established. Ur plants are fine I think, certain strains sometimes stop vertical growth altogether while sexing and cocentrate on flower developement. I think thats what is in your case, but with the correct lighting over them, those colas are going to grow! I have had colas grow 13 inches taller than the rest of the plant flowering, all fat, tight, monsters that were sic, thats what ur trying to achieve! hope that helps! oh yea dont get any nutes with nitrates in them at this point! ur going to want to be looking at stuff with 0/10/10 or something along those lines.Lowest nitrates possible! concentrate on potasium and calcium. good luck