Well as to the topping, I don't really know now that happened. One day when my plants were little one of the super skunk just seemed it top itself. So it was done when it was a seedling.
I don't know if that's an average yield or not, 4 plants = 3.5 oz with a 400hps light, I mean I know some people say they can get a gram per watt, but that's hard to do. My skunks were about 2 and a half feet, the hindu kush were LSTed and were about 3 feet tall but would have been like 4 if not LST.