Yellowing leaves ??

Looks like a calcium deficiency. You can look up weed leaf problems. Look for a chart with common leaf issues. Looks very much like calcium.

My guess is heat or light stress o some other kind of stress due by env (T-H-VPD)

I think you may have developed a case of leaf septoria. Looking at your diary you’re stating you’ve had some heat issues. Judging by how pact your tent it’s possible that it has had airflow issues as well along with RH issues. Flowering requires low humidity and low temps. It can take higher temps but you’d also need to supplement with extra CO2 to handle high temps. Do some research on leaf septoria. I may be wrong. Maybe other growers have a different opinion on what’s going on. If it is septoria you need to carefully remove those leaves and burn them get rid of them they are infected. Once you’re finished with this grow I highly recommend that you clean the bejesus out of that tent before you grow again.