how is the canopy? is it even throughout? You said your room is open right. Doesn't the c02 get out if it is not sealed? genetics are the most important part. Maybe you don't have a high yielding strain. I have never grown those two so I am not sure.
fan for air movement?
You seem to know a lot and have everything under control.
Maybe switching to different nutes might help or adding to them.Scrog? How do the roots look? do you need a bigger vesicle? What are your grams/watt?