Here is a post I wrote yesterday for another rider, adapted to your question. I am of the opinion that body position and rope tension are the most important components to generating height (pop) off the wake.
Work on good body position into the wake. Be sure to take a gradual cut toward the wake, if you cut too quickly you will be pulled off your edge at the wake and without even realizing it. Try slowing your initial cut to the wake, keep the rope low (belly button or so), maintain a gradual edge to and through the wake. DO NOT JUMP for the board, simply keep you legs rigid or think of standing of the wake, but DO NOT JUMP. The rope tension you build and the wake (no matter the size) will do the rest. Also keep both hands on the handle. The gradual edge to the wake will help you maintain good body position and keep you from being pulled off edge. Increase the strength of your edge as you become more comfortable. As everyone else says PROGRESSIVE edge is the key, keep the initial turn gradual, the edge strength will increase as you approach the wake, hence progressive. Good luck and keep us posted on your progress. The Book (DVDs series or Media) and Higher Education are both great resources. The Book Media is probably the best value.