Hi starting to see some brown spots and yelloing F...

Yeah, you've got a calcium deficiency going on here... I'm not familiar with your nutes but if there is a lot of nitrogen in them, this can cause calcium to be locked out and your plant can't absorb it. I would also suggest you lower your PH to 6.2 as this is the "sweet spot" for calcium absorbtion. If you think you've got a lot of nitrogen in your soil, you need to do a flush to clean out the nutes/salts that have accumulated adding in 1/2 nutes (but no nitrogen!) with the last gallon of water... If you know there's NOT a lot of nitrogen in your nutes, then adding some calmag may help (but only give this to the ladies once a week!). The damaged leaves will NOT recover but if you can get a handle on the problem, further damage will be avoided. Good luck!