Any ridges would be caused by the bit not cutting dead center or because there is a gap from following the template around the edges and the bit is not fully cutting to the bottom which could be corrected by running the bit down the center of the template without touching either side (if the guide is narrow enough to allow that). John we need to see the bit , the guide, and the template. You can post pictures from your hard drive by using the Go Advanced posting option.
Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.