It took me a while to get used to effectively pushing and pulling with my pedals. One thing I practiced was to try and just pull on both pedals without pushing at all. Just the opposite of what you were doing before clips. Let the shoes just take a ride on the push stroke. You can also alternate by pulling on one side only, then the other - pull only and no push. You can even throw one shoe out of the clip and try just pulling as you ride. What I learned was how the pull stroke worked and once you get used to it the result is a much more efficient ride.