There is a ratio of NPK/other micronutrients to biomass weight you have to respect if you grow a plant 50% heavier. Generally the nutrient ratio to maintain quality when you grow larger plants faster is 110% of increased expected biomass growth.
Bryan I am involved in a trial in Kalamazoo where we tied the co2 system to the existing mist system. We can use co2 infused mist or fresh water mist with a simple valve switch.
Have been rooting garden mums for a large grower, they are very impressed with what they have seen
Yes re more spray applications during plant lighting periods to assemble sugar.
Re mold - apply daytime only. Re plant growth, to maturity you could spray through to bud harvesting on the leaves to maximize sugar delivery to the buds.
We have proof at St Cloud State where Matt is using both dissolved CO2 spray and gassing of CO2 in a variety grow trials and know the consumption patterns of both. .
Vary by species of plant and maturity of the plant. At the very beginning of plant seedling stage would be more frequent with variable CO2 concentrations in the water based on plant maturity. The highest dissolved CO2 concentration will be on juvenile veg state plants.