one thing I noticed you are doing, which i also did for a long time, is experimenting to much with trans planting and venting and nuts. first back way off on your nuts and watering, your plants will start to do much better because the roots will need to grow and search deeper in your medium for moister. stronger roots stronger plants.
one thing i would do is instead of sucking air from out side into the grow box in i would go to radio shack and get one of those small computer fans, cut a hole inthe side of the box and screw the fan to side blowing out, best to be closer to the top from my experiance. next drill some small holes on the oppasite side of the box closer to the bottem. this will give you air exchange which is needed and will suck out the heat from the top of your box. fans are cheap, $20 or some shit like that. i would also take a peice of black cloth and hang it over the fan to keep light out in case you have to flower in there also.
with ventilation and with out the cold out side air you can now shit can that incadesant light that is doing nothing for the plants and replace it with a nother clf. more light nicer buds and you should'nt have a cold issue now since your not pumping cold air in to the box. do you have a timer? appliance type that plug in work great for what you need and can get at home cheapo. it will make life easier because you won't have to rush home from your girls house in the middle of givin her a good one because oh shit, i got to turn my lites on.
looks like you got a good start for your fist grow and your doing better than i did my first time. just don't make it harder than it is and over think it and when your done with this crop make sure you hook a brother up.
peace, redeyed