Hey, buddy! 👋
You have a problem with the acidity of your watering, and consequently with the acidity of your soil! Make the acidity around 6.3 pH for a plant of your age that is entering the flowering phase! Don't try to overfeed the plant with fertilizers and additives! Aim to give 50% of the recommended dose from the manufacturer, gradually increasing the dose if necessary, in case you notice the beginning of a deficiency! 👌
Good luck, buddy! ✊😇