First grow - Tangerine dream

needs more nitrogen or senescence.. if it continues to progress upward, you need more nitrogen. if it is isolated to shielded, lower leaves, then you can ignore it. This looks more like a nitrogen deficiency, because i see paling leaves creeping upward on the plant. pH could be causing it, but in those cases you usually see more than 1 symptom displayed. This looks like N-def 95%. check you pH. Make sure it is somewhere 5.8-6.8 range. "They" often say a plantn does not need N in bloom, but "they" are wrong. Every cell produced needs N as a building block even in bloom. i've never needed to drop N more than 5-10% from vege to bloom and i track ppm mixed of every molecules every feed. I'm faily familiar with safe ranges that work for all of them, relative to my hard water, of which npk is not augmented by hard water like Ca/Mg/S is, so the safe zones of npk are translateble to other gardens. So, maybe take the fertilizer component with the most N with least impact on other things and bump it 5-10%, then wait and see how that goes. Don't have a major reaction... slow and steady wins the race.

If you don't want couchlock and prefer a brain bending head high, harvest now. Mostly cloudy = peak THC = head high. Amber = CBD = couchlock. Once your plants have 97-99% brown pistils, they are in the harvest zone for peak THC and maximum head high effect (mostly cloudy, few amber). Once there are 100% brown pistils, the plant is close to dying, giving an inferior high with greater couchlock effect (more amber, less cloudy). New pistils right at the end is normal, the plant is just giving one extra last push to get pregnant/seeded. Going to 11/13 can stop the flush of new pistils (as a reference for future grows with photoperiod grows). Congratulations for not falling into the autoflower trap and growing superior in every way, photoperiod plants! It is time to enjoy the fruits of your labors!