I don't know if you want my 2 cents, lol but I'm gonna give it cus thats what I do
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From the pictures you posted yesterday those plants look like they've got 3+ weeks left. They are all still heavily growing it seems, which means they really need to finish that BEFORE going into the swelling and ripening period.
I've done several flush and no flush tests, and read about many more. I've read the science behind how the plants work and uptake and use nutrients. I advise everyone to do the same, do the tests, and read the actual science, not forum or weed growing literature.
I stopped messing with flushing years ago. I usually only feed around 700ish ppm and I feed till harvest. I dry remove all the fan leaves and dry the branches whole nice and slow 7-14 days. Then brak them down and paperbag them for another 3-5 days to equalize the moisture. When they are perfect to smoke, they go in jars for storage, or bags for friends. People rave about the flavor and smell of my buds. The only person to ever complain was a fellow grower that specifically had a problem with me not flushing. So one day I told him to come over I had a new crop that he had to try because I had flushed it this time. So he came over and loved the weed, and explained to me exactly how flushing had made it better then the last batch......The thing is I never flushed it. Its in peoples heads because they read it in a grow book one time, or online. Flushing scientifically does absolutely nothing beneficial or effective to the plant.