I feel bad popping your cherry on this forum but.. that is really entirely up 2 you. I am not shitting you, if it was up to me, I would NOT do it. Topping is something to be done during the vegetative stage, and even then it is given some time to recover.. this is the time that your plants are trying to produce flowers and not new growth, so, anything you remove at this point will essentially just result in lesser quantities and quality