Hey Growmie,
Those yellow tips are a sure sign of nutrient burn. BioBizz does have nutrients in it and then your adding nutrients. I know your going by the schedule BioBizz gave you but those charts are normally based off photoperiod plants not autoflowers. Autos are super sensitive to being overfeeding so I would use 1/4 of what they say so this doesn't continue. Hopefully I answered your question and remember Happy Growing and Free your mind one puff at a time.