If your smoothing plane leaves ridges on the surface of your workpiece, even after meticulous sharpening, try adding a slight arc to the cutting edge of the blade, called a crown or camber. Chris Gochnour adds a camber when honing, applying different degrees of pressure to achieve a uniform arc across the cutting edge. This comes in handy for all smoothing planes that are intended to give a final polish to a wood surface, and also excels when cleaning up dovetails and flushing door frames after glue-up. Once you learn this technique, tracks and ridges will be a thing of the past.

From Fine Woodworking #222