honestly i wouldnt have gone 12/12 already. Even if your doin sog you should have let the plants get bigger than that unless you have a super low ceiling. Looks like with the amount of room you have you could have let them grow a lot more. I'm growing 6 plants right now in a 33inX33inX6ft cabinet. I let them get to about 18-20in before i flowered. You can expect a plant to double or so in size from the start till end of flower. Usually with the most growth being seen in the first three weeks. I also topped my plants when they were about 4in tall (when they had 4 or 5 nodes) which gave me twice the tops. Topping isn't a good practice if your doing sog because the plants get too bushy but a real sog grow could have as many as 15 plants in an area like mine. With the amount of plants you have you could have topped them and let them get much bushier. You can take a look at my grow log and see that even after a week i'm showing significant signs of flowering. At this point my girls are 2 weeks into flower and the flowers are very visible. I will have pictures of that posted tomorrow if your interested in looking.

my grow log
http://boards.cannabis.com/grow-log/...-grow-log.html