This late in flower,super crop wont really help this plant.If I had a height issue tho this would be good way to solve it."supercrop" "LST" "topping" they all basically do the same thing..it slow's the growth of the main branch and causes the lower branch's to compete for top position.
You want to "pinch" the stem hard enough to smash the fiber's this make's it bend with out breaking,but be careful not to pinch it clean off.
I'm sure you'll have question's so feel free to ask and i'll address them as I can.

Dive:stoned: