14 weeks into flowering, plant dying?

White widow photoperiod feminized on 12/12 on general hydro trio nutes up until a week ago, gave plain pH'd water with light nutes since then. Included are photos of the trichs from the most mature part of the plant/closest to the lights. Is it just time to harvest and it's dying? Given to me on week 9 so this is all I know about it. Decided not to harvest the top half early and let it run its course and this happened. Water isn't perking her up this time.
 

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Agree with snake, looks like potassium deficiency to me. A lot of people mistake burnt tips and serrations with overfeed when potassium is the culprit.
I've got the general hydroponics trio and hydroguard plus cal-mag. Should I go back to feeding and see what happens? If anyone knows what I'm talking about I was using the schedule provided by the growweedeasy website and stopped the "ripen" ratio a week ago and have been using plain water with hydroguard pH at 6 since. I stopped because I assumed I was frying it but may have had too hot of temps at 81 degrees for too long one day. My central AC sucks, and I've debated on moving everything to a much cooler area.
 
If that is potassium deficient it's not from a lack of potassium being present but more than likely due to nutrient antagonism locking it out caused by overfeeding.

Calmag isn't needed. Too much calcium will lockout potassium. Many people overuse calmag and feed with every watering causing a buildup of calcium that can cause issues with other nutrients.
 
If that is potassium deficient it's not from a lack of potassium being present but more than likely due to nutrient antagonism locking it out caused by overfeeding.

Calmag isn't needed. Too much calcium will lockout potassium. Many people overuse calmag and feed with every watering causing a buildup of calcium that can cause issues with other nutrients.
I was using it every watering. How to fix?
 
That explains it
This is the chart I followed, apparently I made a mistake on the last gallon of feed water I made and used calimag like florabloom.. "Ripen" or week 11. Definitely overfed at one point, explains why everything was going so good up until last week. Also means I could have skipped florabloom entirely that week.
 

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