Your pedals will probably have to be in a different position from what they are on level ground. My right foot is usually a little farther down in the back when I'm going downhill. It makes my rear leg a little straighter and gives me more leverage to use my body weight instead of my muscles to control the pedal.
Less muscle use = more stability trackstanding for me.

Nothing beats finding a parking lot on a hill and riding around in circles for a few hours.

tim