So the browning is coming from nutrient burn. now the shultz fertilizer I would cut what ever it says down to half the amount to the 1 gallon jug of water. On your next water flush it with 4 gallons of water then let it dry out extreamly well. Try to look for a nutrient called Neptunes. Now the fertilzer you are using for the veg has to much P in it. try to look for something like 10-5-10. you want a higher second number when u flower just like what ur using now. But just keep a eye on those brow spots. If u think u have fungi on your soil it should look white. But any other questions just let us know. Have fun be safe