Well, time for another update.
MZ, You were right, I'm already seeing the difference from adding the second light. I've got thing set up so that my biggest/bushiest plants are in the center between the lights and are getting hit from both sides, and the difference in the bud production is amazing. The grow in general is going just great, especially since I moved to the basement. Only odd thing is that my plants are running late when it comes to finishing up, and I had to harvest a couple before they were completely done so I wouldn't run out. I'm guessing that the extreme temps I was going through before I moved into the basement stalled my plants development, and hopefully the change to the basement will allow me to re-establish a bit more reliable schedule once I'm through that particular group of plants.
I'm still battling spider mites, but I'm slowly winning the battle. The little bastards are only getting a few leaves on the lower branches these days, and I'm hoping that sooner or later I'll manage to wipe the last adult and egg out and become mite free. I probably could have killed them off by now with more aggressive action, but after the problems I had with my first grow when I went overboard on mite suppression I decided it was better to let a few mites survive then to spray heavily, stunt the plants growth, and screw up my harvests. I'm still looking into predator bugs, but after what happend to the lady bugs I think it might be a good idea for me to have lights with covered hoods before I use bugs again.
Had another harvest the other day, though it was another plant that was kind of iffy. Not much in the way of amber trichs on the main cola, and the pistils hadn't retracted, but the other branches were all looking almost overdone. Suppose I could have done a staged harvest and left the few buds that still needed some time, but I didn't think about it until after it was too late. I didn't bother weighing this one, but it looks like it's going to end up yielding at least as much as the last harvest, and probably a bit more. Speaking of which, after drying the last last plant weighed in an 2 8/10 oz. Not what I might have liked, but since each plant coming up behind it is bigger I think I'll be in the range I'm looking for soon.