This technically is all true....but monitoring your VPD is most crucial. I just listen to my plants. They'll tell you what they want or do not want AFA nutes. ( Organic is much easier in this aspect IMO) And once CO2 levels are increased and your feed program & VPD is in check, you can then adjust your light intensity accordingly and watch how the plants & environmental conditions react. Personally, when I choose to use C02, I only use it in the flowering stage.