Don't worry too much about stem color - many plants just get red stems. As long as the leaves and the plant look healthy overall it isn't necessarily a bad sign. Nice grow, good fast bushy growth, I'm a little surprised with the light setup (mainly the lack of more blue light). CFL's are underrated, though. I use them exclusively and have had a lot of success with them. You can't beat the price, I find 32watt bulbs for $1 all the time, and get multi-light bathroom fixtures from thrift stores for $4 each - you can use them as is by stripping the wires and attaching a lamp cord ($.99 from thrift stores), or do the same but take the sockets out of the fixture and group them closer together or hang them. What I've found is that (you may hear differently, but this is from mucho experience) you can put CFL's about 3-5 inches away safely, but any closer and the WILL burn the leaves after a while. The leaves can get close and even touch for short periods without problem, but if they sit right next to the bulb you will get brown spots.
The drooping is odd. It looks like underwatering, but that doesn't make sense with your setup - possibly overwatering? The heat may be in the 70's in the closet generally, but check it right around the bulbs - it will be higher there. I also don't see a fan - that will not only cool the plant, but get much needed air circulation to the leaves and make the plant stronger. Overwatering (lack of O2 to the roots) would be my guess as to your drooping. I would try to get that fixed, it will just make for a stronger, healthier, happier plant.
I would put out the money for some really good nutes - that can make the difference between a lush, beautiful grow with only a few minor problems here and there, and constantly trying to diagnose and fix issue after issue. When done right, it seems easy as pie. Nutes with some lack of micronutrients or something will just have you eventually scrambling to find out what went wrong, and buying more stuff in the end to fix things. You should be able to get some great nutes online for $40 or so - well worth it! And that should be enough for several grows.