i've got a seven foot beast outside. i've got it tied down to about 3 feet, needless to say, she's growin sideways. got it tied down lightly with paper rope, about half way up the plant. only did this after about three months old.
she was a strong girl, took some training before i decided upon doing this.
my top turned up to the sun, not two days after the tie down. didnt bother tying the arms down, let them do their thing. just shifted them a bit to allow for more sun.