4 Big Sweet ZZ's

Another week of flowering has passed. The grow again hasnt changed much. The plants look very healthy, all leaves are deep dark green, but the buds just dont seem to want to grow. I'm not sure if i'm doing anything wrong and I hope the flowers are picking up weight soon. The flowering period was listed as 7-9 weeks, and this was week 6. I'll do a growquestion to see if anyone had this problem before or knows whats going on. Next week i'm going to defoiliate them a bit, maybe the stress pushes them to start flowering quicker. Till next week!