I've never had an issues all the other seasons with those levels of co2.
But I mean its worth a shot. Il dial down my co2 to 600-900 n decrease my temp to about 75ish....
How does decreasing co2 help? What's the science or logic behind? Just curious..... I'm brewing caps tea right now. Hopefully they bounce back. Still early in flower n I would like a smooth transition....
This is not a personal experience, i read people having problems with too much co2. After saturation point co2 is no longer beneficial.
Messes with stomata function and slows growth. At higher saturations stunts the plants.
There were some researches on wheat with high co2 saturations and i think several studies on c3 plants concluded with 1200ppm to be optimal for supplementing co2. (I can dig out a couple of them but now kinda tired :))
Anyway, if the plant is not perfectly healthy to begin with (minor problems will be amplified) that much co2 could be causing it.
Just dial it down and see if it helps, i’m not diagnosing your problem but making an educated guess.