Scrogged Seni Star week 3

Hello new to the forums here seems lime a great site and I wanted to ask for some tips on adding co2 diy style? Also wondering if you guys and gals think I have defoliated enough? Thanks for the help!

That doesn't help very much

Before defoliating and after.

Dam was hoping for helpful advise, guess nobody has any quality information on co2 diy or defoliation here?