Around 1200 ppm target, I always get a bit of overshoot up to 1400ish, and then re gas at -100 ppm below 1200. So real world it swings between 1100 & 1400ish. And I do an air exchange every 2 hours lights on.
Was and am running at 28C with a .5ish swing each way. RH swings 65-70ish%.
Yeah mate, about 10 days out I start drop temps, ppm and RH, and also lower lights off temps and RH over lights on.
That’s a fair amount of swing ozy....
Yea I noticed no real improvement running 1500ppm and 1200 tbh.
Probably too late now you’ve changed to led but did you try running your room warmer at 30C?
I didn’t realise how much this affects them when dosing co2.
The higher temp is 2nd in-line of importance for me, (more intense lighting being priority)
Helps put plants into overdrive I think.
I personally found growing in dwc a lot easier to tune in to the plants when dosing co2.
I could monitor how much water/nutes the plant is drinking or not and match my RH to suit.
Just gotta watch the RH doesn’t drop too low with those temps or the stomatas will start to close and you just waste the co2 addition.
Try running your room a little warmer if you haven’t already and see if you see any improvement??