As I mentioned in another thread, I had issues with MC as well.
Everything was going great in veg and for the first 2 or 3 weeks of flowering, aside from the constant PH fluctuations. I'm used to my PH staying pretty rock solid. MC was all over the place - up one day, down the next. Kinda odd. Whatever - did the daily adjustments to keep it in range.
By mid-flower, it seemed that my girls weren't stacking as much weight as they generally do, but that's sometimes difficult to judge with simple observation. The last couple weeks of flowering was the real heart breaker. I'm used to 8 full size girls drinking between 3 to 5 gallons per day. With MC, they were using about 2 gallons a day, and I knew that was going to translate to diminished returns.
In the end, a room that generally produces 2.5 to 3 pounds per harvest clocked in at just over a pound. Had to cancel an upcoming Nicaragua trip. Oh well. Lesson learned - back to my old formula. Based on some of the pics I had seen, I really hoped that MC was gonna perform for me.
* Ebb & Flow, LECA, RO Water