i disagree on that one, topping would result in bushier, more bud sites rather than just one giant top budyou don't cut anything the plant is a natural bush if the plants not bushy you're not growing it right. topping just incourages disease
I topped mine when it was about 12 inches and now it has grown 4 big branches instead of the one middle stem and is covered in buds so i will be doing it from now on
cheers Bifter