Flush?

autof - if the buds don't also pale, then what make you think there is less chlorophyl in the flower? LOL ... whether you flush or not won't make a difference in output. can save you a little effort and a few pennies in fertilizer. If any of those symptoms are from a toxicity, diluting or a water only irrigation wouldn't hurt the health of the plant and make for a healthier rootzone. i stopped flusing after the first year. never get a hay smell, lol. burns white. tastes great. smoking for 30+ years so as far as consuming it, i know the spectrum of what is out there. killing fan leaves is all you accomplish with a heavy flush. and, if those leaves don't contain enough building blocks for growth (ripening is growth), only hurts the outcome -- talking about a matter of days out of ~100, so a small effect either way. i would argue keep it healthy as you can. the symptoms i see should have been addressed long ago when they started. The coloration is likely senescence, but the burnt and necrotic bits are probably nute-related. looks isolated at the top with some tacoing, could be light-related or heat related from the light. it doesn't look overfed, even some slight chlorosis in leaves not at the top. I don't see a major reason to have a big shift in fertilization unless you want to save a little effort. the 'peanut gallery' is more representative of the person that thinks less chlorophyl in fan leaves somehow impacts what constitutes the flowers, lol. the dead leaves definitely have less chlorophyl, lol, but the buds still have the same shade of green, at least while on the plant. That green color comes from chlorophyl. For it to 'gas off' your buds would have to bleach.

The peanut gallery will say no. That it's not necessary, and indeed you are not flushing out any nutrients from the plant when you are doing so, BUT, you want to deprive the plant of nutrients as much as you can in the end to get the plant to consume itself and start yellowing up. The aim is to get as much chlorophyll out of the plant as possible before you chop. Chlorophyll is what makes your weed smell like hay and taste like shit. Thats why the curing "gas off" process is a thing. It's gassing off the chlorophyll as it breaks down. I flush.

You should be safe with a 10 day flush. Leaves will turn yellow, but that's ok. As there will be no more nutrients available in the soil, the plant will take them from the leaves. A plant doesn't have to be totally green till the very end. Fall or autumn is yellow, orange, red and brown. Sometimes even purple, but that's more genetic to the strain.