Hello Alec,
First, you are still way lacking lighting. If you plan to use
cfl lights for that type of plant you are going to need lots more of them, or get them outside in the sunlight. Second, cutting back the lighting doesn't induce flowering in that type of plant. Peppers are continuously flowering/fruiting plants, and flower weeks from sprouting. They aren't dependent on spectrum of light, and/or use changing light time to determine what season it is.
1. What size reservoir are you using? If your only changing it once a month it must be large.
2. You shouldn't ever let the pH get that high. One reason it could be getting that high is because you don't change the
nutrient solution often enough. You should check the pH every day, or at least every other day adjust it as needed to keep it at about 6.0.
3. You should be using some type of filtered water rather than tap. This could be a cause of a few problems, including pH and nutrient balance problems.
4. Botanicare makes a lot of things, therefore I have no way of knowing if you are using the right type of nutrient, nor if you are fallowing the directions or mixing them correctly.
5. Why do you think your water is low in oxygen? It does make a big difference, but there must be a reason you think so. There are ways to increase the dissolved oxygen levels if it is low. Also if your running a drip or flood and drain system, the roots get oxygen while the water is "not" flowing. Even more oxygen than from the water. They get oxygen from the air that is in the
growing medium.
6. What is the water temperature? Plants abort fruiting when water temps are high. It's not just foliage that can suffer from heat stress, the roots are just as important. The optimum water temp is be between 68 and 72 degrees F. Higher than 80-82 and it can cause heat stress. Below 60, and it slows growth.