Most likely, technique is the issue and not the wing. Many will argue that a wing isn't even needed until you're getting into 28-32 off or shorter.
Too much speed at the ball is probably not the problem either. The problem is likely the DIRECTION of speed at the ball. Cross-course speed is good and down-course speed is bad.
Too much down-course speed is usually a byproduct of pulling too long past the centerline. To ski the most efficient path, all of your speed needs to be built into the wake. If you aren't generating enough speed early enough, then you most likely will feel the need to continue building speed after the wake by continuing to pull. Unfortunately, this will only increase down-course speed and not cross course speed.
Practice trying to build as much speed and angle as possible before the centerline. Starting with a wide gate and getting up on the boat is the easiest way to lay the foundation for this in the course. And if you do it correctly, you'll be able to begin to change edges behind the boat and still have enough speed to carry you out wide and early for the next ball.
The more cross- course speed you can ski with, the slower and easier a pass will feel. The more down-course speed you ski with, the faster and harder it will feel. This is all a byproduct of where you build speed and change edges in the course.