Anthony, there is somewhat of an inverse relationship between edge and speed. Speed being the obvious and edge being the amount of force exerted against the boat/rope. The faster you are going (higher speed), the less force you can produce against the rope.
Typically when learning to wakeboard and jumping the wake, riders will cut out and lay into a hard edge. This results in a lot of speed when you hit the wake, but very little edge. However, jumps and inverts require lots of edge at the wake and are not so dependent on speed. So the term "progressive edge" means to reverse what comes naturally.
Instead of laying into a hard edge toward the wake, start off with a lazy cut back towards the boat and let the edge/cut build up slowly with the intent to maximize your edge and not speed at the wake. Try to save some edge so that you can lay into it even harder and explode right off the wake.