i would advise against worrying about weight transfer. It's more of an adamant approach to the skid. Think in your mind "no matter what i am going to hold these pedals horizontal". To do so it will take both your front and back leg working together. Don't worry about leaning forward because if you rely on that, you won't be able to stop as fast. Watch Andy's portion of mash if you want to learn how to do a seated (or close to it) whip.