Yea that looks like a pretty small space to put more than two plants.I was thinking of using to 2 strongest looking females and take away the other 2. My grow closet is 57cm x 40cm and 150cm tall. If your having trouble with 80cm ill be having alot of trouble witdth 57cm. Maybe i can veg for less time? or maybe not top top? I would probably be better off with 1 plant, then i wouldnt need to worry about the space.
I would say you could be better off with one.
In this space the light wouldn't penetrate the tops
I'll post some pictures soon of the plants lower parts and you'll see...