this.
its not necessarily the nitrogen, phosphorous, magnesium etc, itself that affects the end flavor. Its the effect the mobile nutrients have on late flower chlorophyll production that actually impacts taste and burn negatively. Although excessive phosphorous and sulfur late flower can def make those little sparky trichomes weve all seen on buds before, but it takes a TON to make that happen.
The reason a flush even affects flavor and burn beneficially is because it slows down chlorophyll production, which is predominantly made out of nitrogen, magnesium, and phosphorous. Which allows it to out gas and break down faster during the dry then it would have otherwise.
When you sample 0 day flushed flower, vs 10/14 day flushed flower on spectrographs, terpene content and mineral content of the flower will actually be more or less the same, if not slightly less aftr the long flush, this has been proven several times and verified independently from multiple sources. What changes is peoples subjective reports of the way the smoke feels in the lungs and aftertastes left in the mouth, and their reports of how evenly and fully the herb burns. But thats actually a chlorophyll content thing, not a mineral content thing. Chlorophyll that isnt broken down mineralizes in heat very easily, hence the chunky black crystalized ash from poorly dried and cured, unflushed smoke
You just want to try, if you can manage it, to have chlorophyl production on th downhill slope by the time you cut. But the worst case scenario is that you jut have that kinda harsh burnt chlorophyll taste going on after a rip.
But if you seriously nail your dry, like make it take at least 10-14 days, youll usually give your chlorophyll enough time to outgas and break down before jarring. So even if you cant get that chlorophyll production dropping before harvest, you can definitely still manage that in the dry and cure quite effectively with a little care.
Fun fact: If youve ever wondered why heat dried buds shrink so much more then air dried, its because heat exposure makes cellulose coil up like a slinky lol.