@Supercalifragilisticexpialidocious,
Are you sure about that?
Because I watched a lot of videos about flushing, some youtubers are flushing their plants 21(!) days long before harvesting and as a new grower, I have no reason not to trust them.
www.youtube.com/watch - there are results of a study about flushing, you can watch it if interested.
www.youtube.com/watch - There is also video about lab results, how darkness before harvesting is affecting THC level (and not only) of the plant.
By the way, I highly appreciate that you took a time and tried to solve my problem. ✊
Happy growing !