The only time i go 60 percent wieght on the front leg would be on a power punch. Otherwise i stay pretty much balanced. Also all these movements i am talking about are small subtle movements. Like when i dip my rear knee, i turn my rear foot in and barely rotate that rear knee inwards. I will say i worked on taking some wieght off my lead foot and went 60 rear and 40 front. I seemed to be able to throw nice hard and crisp punches like this.