Hey fellow grower. So maybe just an advice, that dont do flushing it does not do anything. Please take a look at
www.youtube.com/watch . So there is no point of canceling nutrients for flushing. You can feed them to the end. And this way you dont have your problem of flushing the plants that actually need food. BTW: From your pictures i would say 1-2 weeks more, i cant see any amber trichomes. Anyhow i wish you all the best😎