Youre doing fine! let that baby go for at least 16 weeks, I would let that baby roll 17. you will see that bigg growth week 15-17. i was messing around with fox farm for a while untill I watched an episode of the future cannabis project. They basically described the problems facing all plant growth nowadays. https://youtu.be/i8WRgBPgCjo it was illuminating. "The science of living soil systems."