why not use big time exterminator or Nukem? its organic as in totally organic.
Or Conserve SC, it goes away in 4 days not organic kills everything.
1st week of flower you could actually spray anything and it would test negative.
That bug looks like an easy kill big.
your issue is not to burn the new growth,
The photo is to close of the head Id need full body to know for sure.
http://www.flyingskull.net/NukeEm.html
This will kill almost everything, it wont kill eggs so they come back and you use again.
Turn off lights for a long time and closely follow the label.
For me I always test one plant before I hit them all so it wont burn everything.
Also that bug looks HUGE get sticky traps?
Raise the lights or use a T8 bulb for a day and never use a light on wet plants.
Cant you dip your plants are they small?
use a trash can if your infested.