Ok hears that photo,
I got about 14 grams off that one, the second plant (the little one that appears mid journal) I got about 6 grams off, she really suffered in the competition for light and space, I planted her about 1 month after the 1st.
For the 3rd grow I changed it up a bit gave her an overdose of worm poo and I got 24g off her, but she FILLED the box insanely, she is burnt from the cfls in this photo, but you can see the size they get in there!
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As for your fan system, I have fiddled and messed with all sorts of ideas and the one thing that's for certain is that computer fans don't push!!! Doubling up doesn't work either.
The most important thing in closet grows is keeping your air flowing and fresh, if all you got is computer fans then don't put anything in front of them.
Also you have to create a "negative" air pressure in the box if you want to remove the smell, the easiest way to do this is have a fan moving the air out and then no fan pushing it in, or 2 fans moving the air out and 1 sucking in.
If you don't have a negative air flow the air will just be pushed out of every little hole in your box and NOT out of your carbon filter.
Don't get me wrong, I can see you know what your doing, your build looks solid, but I'm just trying to offer some advice :0)
Peace out