Ok, not the brown and crispy I was imagining.
Some of the spots look like nutrients splashed on the leaves. The round spot in the middle of that one leaf for example. Your leaf tips also show some burn. Some of the leaves toward the bottom with the brown are probably just senescing from lack of light. My lowest leaves do this too if I don't keep up with defoliation. (Yes, I'm a defoliator.)
Full disclosure, I'm no expert, but I'd do what I recommended. I don't think the bennies will help this, at all.
Also, depending on the variety, it may be a long flowering auto. If it's Sativa dominant, this isn't uncommon. And it's rarely done when the breeder says. I project at least an extra week, maybe two. I just finished two Snowstorm #2, and I chopped 9 days later than they said. If I listened to them I'd have cut nutes a week early.
Don't sweat it man, it's a learning experience. I ruined three Fast n Vast my first auto grow. Over fed them.