Actually topping is a very common practice around here in fact before photobucket fiasco we had a great topping guide here. I bet the majority of members would highly recommend it increase yield exponentially and to avoid too heavy plants. And no you wait for the fork before topping to ensure you have as many growth nodes as possible.
I don't think topping is a common practice around here. I don't really see the point unless really necessary. But IF you would do it, wouldn't it be before it started to fork?
Thank for the reply tho. But I'll wait for people who top to speak up.