Your plants look good. Its just they will grow much slower, at high 60s-low 70s. Be good to get it down to 75f, lights out. And keep the fan(s) on. constant, fresh air exchange, cannot be stressed enough. No such thing, as to much fresh air exchange. Outside though the total ppm of CO2 is seemingly low, its the never ending supply of it, that makes he difference.
Consider people run 1200ppm CO2 inside, and most arent running 2100umol.
Outside, the sun, is 2100umol, and CO2, is roughly 421ppm. The highest its been sincse e before humans walked the earth.
In 1850. It was 180ppm-190ppm. And the Sun, was still 2100umol. Weed grew just fine with 180ppm CO2 for millions of years. Theres just so much outside, theres no way the plant can use it all.
But if you have really high light levels and not adequate fresh air exchange, or a nice CO2 set up. You risk damaging the plants.