Different strains grow in different ways example: White Widow and Blue Berry are short but exstreamly round and Skunk is tall and not so round. It may be best to do some research in the type of plant it is and read the specs. I have found as it grows and each leaf internode will produce two stems, than it will be short and round. Now, Skunk and Northern lights will grow tall with less stems. I'm a big WW fan myself. Skunk type makes one, just stupid.
Just from a glance, your plants are of the white type and most likely be short (under 4 feet) and round. I believe they will fill out about 3 to 4 time there veg diameter.
The large sun leaves are touching the sides now, in a short time this will cut the light and air flow from the lower part of the plant. Check out Gauro's plant (white type) and see the diameter on it. He has the most excellent example on how the white type branches.
Also, you may want to check into a dehumidifier in order to prevent mold. But, they can be very loud. The reason I say this is because the large fan leaves are very fat, which is good in the veg stage, but not very good for the flowering stage.
Wish you luck,
Grim