Week 9 flower, when to flush

Im in week 9 and my flowers definitely had stunted growth but they look amazing due to lack of CO2 and N toxic. (I think)

I think its going to take another 3-4 weeks since buds are still tiny.

What are your opinions? And when should i start flushing?

Ive already started weening down my feed to .6-
8 ec from 1.8 EC Canna Coco, mammoth P. And emeral harvest honey chomb.
 

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