This stuff here:
https://foxfarm.com/product/grow-big-liquid-fertilizer ?
How old are your plants? No where on the directions does it say to use 2 tablespoons per gallon. Even for "Heavy Feeding" it states to only use four teaspoons. Four teaspoons = 20mL. Two tablespoons = 30mL.
So you've over fed up to 1/3 over what the manufacturer recommends for when the plants are at their peak nutrient use period.
The label on the bottle also states the recommended schedule.