Henry, one of the best ways to be obsessed with CO2 is to buy or make a little "drop checker" and use it to get a much more accurate measure of how much CO2 you really have. It is a cheap little device and very simple, but it does give the most accurate measure of CO2 that we have. Once you determine that the CO2 is in the 30 ppm ballpark you can confidently stop obsessing about it.

Current in the plant beds allows more nutrient/CO2 to the plants as this effects the boundary layer issues.

Regards,
Tom Barr