A few things. 1. your going to have a really hard time knowing boy or girl until they are in flower. At 4 weeks old though there definitely wont be enough internodal growth to tell but 8 nodes in 4 weeks is worth an applause. Be cautious though because the taller the plant while under CFL's the further the lower nodes will be from the light so they will begin to stretch. My recommendation (and especially if you plan to clone) would be to train your plants. You can super-crop which is basically pinching the stem and turning down the plant. The first few times you will feel like you are breaking the plant but trust me, the plant will come back and the nodes will start sprouting quickly which is where the buds come from. The plant itself tries to grow the 1 bud which is closest to the sun the strongest but when you confuse the plant and put a different node closer to the sun then that one prospers. The goal when cloning (and for me when in flower) is to keep as many buds as possible on 1 level that way they all get equal attention. I started off doing super cropping but I changed to just training the plant. I keep my 2 mothers in a 1.5 gallon pot to where I use bent up paper clips to tie the plant down and as it grows I make the plant like a bonsai tree only I take it in a circle around the pot allowing the nodes to stay close together because they are close to the light and allowing all the nodes to stay at 1 height.
2. It's never too late to clone. Some people even clone while the plant is in flower. I discourage this greatly because at that point the plant is producing for the flower of the plant and not the growth of the plant. Your root system stops growing when the plant stops growing and the plant stops growing when the plant is placed into flower and that's when the plant focuses all of it's energy on the flower or bud. My recommendation for this is to put all of your plants into flower and wait to see the first sign of boy or girl. Once you see what they are (I mean immediately) you kill and destroy your males to ensure NO pollen is released and move your girls back into veg (24 hour light, or at least 18-6) It will take the plants about 2 weeks to get back with the program and start growing correctly again. Once you see them start growing then your plant is safe to start cloning. Check out the cloning forum as it can be quite difficult to do if you don't follow all of the steps.
3. I'm sure you know this but to make sure that you know the veg cycle or vegetation cycle is when the plant and the roots grow, during this phase you can give the plant light ALL the time but should never get less than 18 hours of light per day. The plant can go into flower at the 4th node (not recommended to do so before 4)or you can wait forever in the vegetation phase forever meaning that you can have a "mother" plant that all you do is cut clones off of it basically forever and every time you cut 1 node, 2 more come from it. It's quite fun to watch.
To make your plants switch phases over to flower you'll want to just switch your lights to 12/12 meaning 12 hours light and 12 hours dark. Of course if your growing this outside then the sun will do this for you, the farther from the equator you are then the shorter vegetation cycle you will have. (You said CFL's so the light cycles will be consistent)
4. Your part about stressing the plant out is really good. NEVER stress your plant out when it's in flower but when it's in veg, the plant is quite efficient at supporting and regenerating. Training your plants in your enviornment is an absolute must so you will really have to train them a lot to achieve this. My current grow is in a 5 foot tall TV cabinet. I have 3 shelves. My top shelf is the large area and I have a 600 watt HPS for flower in a cool tube with a window unit pumping through the back. The middle shelf is for my vegetating clones. They are rooting and then placed in solo cups to get healthy before the flower stage (I leave them in solo cups and have 2 nodes on each plant while in flower this gives me 22 solo cups in flower of course you always could transfer them to larger pots and train those clones and create a new mother or you could grow them bigger while training them and have 1 ginormous bush with 10 or 20 buds on it all at the same height and hence all staying the same size. I have gotten 2 lbs off of 1 plant before but that was under a 1000 HPS bulb) the bottom shelf I have white widdow and blueberry mothers. That is all that is under there. Both plants are very hardy and very easy to grow. The flavor and highs of both are amazing, hence the reason they have won cannibis cup awards. All you have to do is find 1 girl of each plant and then you can clone forever.
5. Lastly, you CAN grow decent buds under CFL. Dont let anyone tell you that you can't. A few warnings though, first, don't be afraid to put your plants as close to the lights as possible Mine in vegetation are about 1/2 an inch from the lights and quite often then touch it (not on purpose) but try to use the plastic guard that the light provides. It's one hell of an invention. ha ha If your lights are too far away from your plants they will stretch and there will be WAY too much space between your nodes making it impossible to have a decent harvest on CFL's. Just be sure not to under-light. I have 2 CFL's for each row of clones and 4 4 foot CFL's for just 2 mother plants. If I was flowering I would have 5 rows of 4 foot CFL's on the top and run 4 rows of plants inbetween them each all staying in solo cups. That's my advice
Good luck, I hope to see some pics!