First grow fluence Spyder 2i

I spent a good amount of time trying on deflation this week trying to increase the air flow and focus more of the plants energy towards the top. I added the Exhale CO2 bag in week 3 and though this was going to help make a difference. In all honesty I didn't think it made much a of a difference and from my understanding going from 400-600 isn't going to make much of a difference. However it does look like there was a significant increase in size and bulking once I increased the PPM closer to 1200. This being my first grow I'm wondering is the nug growth exponential or is the CO2 has made a big difference. Also I started adding the Atami Bloombastic bloom enhancer this week. What do you guys think what was the biggest contributor to this weeks growth. Was this typical of week 3 of flower? was it the CO2? or maybe the bloom enhancer? Would love to hear all your thoughts!!! ....was it the defoliation?!?!