Recurring plant problems after starting co2 supplementation

Your temps seem low for CO2 supplementation. When do you start adding CO2? I add CO2 a week before the flip and also boost the nutes, temp, (85-90F), and light so they get max everything during the stretch which is a huge growth spurt for the plants. I just use an alcohol lamp burning 99.9% methyl hydrate for the CO2 but have a CO2 controller I can plug in to see how much I'm getting and it goes over 1500ppm in about 20 min. About week 4 when the stretch is over I stop the CO2 and let temps drop back to 75-80 and stop feeding so much leaning toward Lucas Formula style for feed with extra K, Mg and S. I've seen too much P screw up bud development so how's your P?

Is odd tho as most peeps using CO2 keep it at 1500 all thru flowering. and get great results.
Edit: G'damned dead thread some joker resurrected and I didn't notice.

Is odd tho as most peeps using CO2 keep it at 1500 all thru flowering. and get great results.

Strange I have be growing indoors since 1988 ,and i have run Co2 around 2500 to 3000 from veg to finish and even my mom room never an issue.
Mine have never seemed to get enough.

U changed something else, I don't know what it is but it's not the co2. Root health? How long do you grow your clones 4?

Co2 controller was calibrated multiple times, I'm sure that's not the problem. Roots also looked very healthy.

I think I have found the problem but it sounds a bit crazy, I think it's off gassing.

The first 2 grows with co2 supplementation gave me the highest yields, after that only low yields, small buds with premature ripening, always around 1-2 weeks after I closed my lung room and start adding co2.

I found this article about bad gas (https://www.cannabisbusinesstimes.com/article/bad-gas/) and that got my thinking, grow wise I didn't change a thing but I changed the floor in my house and lung room where the growtent is for new waterproof PVC laminate.

The article talks about Ethylene gas and that it can cause premature ripening and other problems so when I start doing some research I found out that my new flooring is made of around 25% Ethylene.

My theory is that the small amount of Ethylene off gassing from the flooring normally isn't a problem, window is slightly opened so fresh air is coming in the room etc. but the moment I close up my lung room the Ethylene gas starts building up and will cause these weird problems. That's probably why only the plants that get co2 have problems and the same strain without co2 doesn't.

At the moment I'm growing the same strain again in rockwool with same nutrients basically everything the same as last grow only no co2 this time, it's a bit early to tell but I think I see a difference, 2-3 more weeks and I will know for sure.