if they're still in the veg cycle you could 'top' the plants to form more cola's (and thus more buds). I have topped all mine to creat 4 colas on each plant. Its really easy, but counter-intuitive! Wait till plant has 5 nodes. Just above the second node, cut the main stem off cleanly. This will result in redistributiob of hormones and your baby will develop 4 colas rather than 1 per plant. Theres a guide at the top of the 'advanced techniques forum'.
other than that, get some more lights. Mine are in a hydro system, with a 600watt metal halide lamp, kept about 6 inches from the top of the plant canopy. this way they grow bushy rather than tall and stretched.