remember------the heat over 80 is torture on AF vigour...and the roots want the medium even cooler also,good airflow down low.
hopes that u see 1 drinking a liter a day during bloom !
Looks like it could be one of a few things
A Potassium Deficiency
PH test your water ( i know you probably do)
But i definitively Think Its
Blight AKA Elsinoe Spot " Leaf Spot" ( need a Fungicide)
And you know if you ever want to get some one to do a test grow for your sour jems ......................... I'd Love to