Don't forget to pH your rockwool cubes properly. If you do not pH the cubes first you are almost sure to have problems in the future.
LST is not just for keeping the height down, it is also a means of growing more top buds. When the main stem is tied over the plant sends the hormones going to the top of the plant to the other branches. From that point the lower branches then grow in an attempt to become the dominant top. As the plant gets older and you tie more branches over you end up with more points fighting to be the dominant top. This offers more light to places on your plant that would not normally receive that much light, and therefore a more productive plant. When there are multiple plants in the set-up this also helps keep the canopy even from plant to plant. SCROGs also work on the same principle, the screen forces the branches to grow out along the net (with some help from the grower) and provide more branching from the whole plant. There are plenty of good examples of growers using both techniques on here, I suggest you look for some of those threads and see what results other growers have achieved.