Feed that gurl. She is hurting. You dont seem to be too far into flower, I would hit her with a good npk for 1 0r 2 feeds, then back off and the rest of your feeds use a all round bloom feed with some micro nutes........ Yes it does look like K is lacking, but as we all know some symptoms can mimic others. Thats why I am recommending a general all round feed then a more bloom specific regime for the balance.
Heres a link for more info.
https://www.sensigarden.com/potassium-deficiency-marijuana/
Weather here sux, monsoons are in and humidity with the temps is brutal. Nightly light shows so that aint bad. Burn a fattie and sit in the garage and watch the storms roll in. :smoking: