hy! i am from germany and so may be my english is not perfect, but i can try to help, because in germany we wakeboard mostly behind cables and nearly nobody rides behind a boat.
i think the most easy inverted trick is the railey or the backroll: Railey: u have to start to cut after the corner, you have to cut progressiv(first cut just a bit, then get harder and harder). when your cable really is loaded, u have to do a last cut and lay back(as if you would do it when you wanted to stop the cable)
understood? -i don t think so!
may be i ll find a picture. greetings from germany, cya J@nsi