re: ChillAH's 1st BB X White Widow & Royal Queen Critical Grow
Just mix your nutes weaker to prevent nute burn. but this looks a little like a deficiency. Immobile element as well, so the most likely guesses for me would be Sulfur, or Iron.
If the deficiency starts at the top, it's an immobile element. Iron, Caalcium, Manganese, Zinc, Copper, Boron, etc..
If it starts at the bottom of the plant, it's a mobile element. Nitrogen, Phosphorous, and Potassium.
Some reading I've done suggests that Manganese, and Sulfur are moderately mobile.