When to stop nutrients feeding?

you have a long time left.. keep feeding. flushing is a myth for end of harvest. there are times when flushing is usseful... like reducing concentration of nutes in substrate or trying to correct a pH imbalance etc. if you aren't ovefeeding, i wouldn't wory about cutting back too much. sometimes it's just nice not to mix nutes that last week or so, i do it too sometimes, but i know it doesn't impact mineral content of buds.. it's just cause i'm lazy. when your pistils have mostly changed colors, colas get dense, and trichomes show some amber... you know it's time to chop her down. density pistils trichomes - couhclock or not? some room for personal preference here.. trial and error to learn yous. 10-70%? some ppl go even longer than 70% amber. (30x or greater magnification needed... many cheap scopes lie about their magnification, so check comments of anything you buy - currency checkers, jeweler's loups etc.. or digi microscops that attach to your phone.. lots of options) use all three observable traits to make a consistent decision. odd things happen with each. none are perfect but trichomes are probably your main rail.