Building edge pressure gradually instead of stamping into it: start gently, finish explosively just before take-off. That way the line stays taut the whole way through.
Edging is the one movement everything else in wakeboarding grows out of — direction, speed, jump height. The typical mistake is treating it like an on-off switch: cutting in abruptly, stamping onto the edge, and either the board washes out sideways or the line goes slack. A slack line costs you exactly the pull the pop comes from. What you want is a build-up: start the arc almost casually, far before take-off, and raise the pressure continuously until you push out of the edge with real force just short of the wake's crest or the kicker. What tends to get missed: you steer the edge with hips and legs, not with your torso — and definitely not by pulling the handle in toward you. Arms long, handle at hip height, knees soft.