How are you testing? What does FC 3/6 mean? How about CYA 30/50? I'm guessing you are using test strips which are not very accurate nor reliable. Test your chlorine and pH daily in the evenings. The other things do not need to be tested daily. When you test chlorine in the evenings, add enough bleach to get back up to 6ppm. In your pool, each cup of 6% bleach will add about 1.75pm of chlorine. Use that as a reference to help you figure out how much bleach to add each evening. Your pH is ok at 7.2 which is what I think you mean by 7/2? But, don't let it drop below 7.0. You don't need to add any baking soda. Your TA is fine at 120.