When “following the contour” are you in a reasonable distance to the shoreline. I am assuming that the shoreline doesn’t make sharp transitions like the contour you are following.
Try following the shoreline (the zero contour) with a large offset that will get you close to the line you would like to follow.
This will not keep you at the edge of a weedline but it will help smooth the route.
You might also want to try running the “follow the contour” with the “track” on without fishing at 3 or 4 mph. Then use the track to create a series of “waypoints” to program your own “route” to travel at your desired speed.
The “route” will travel from “waypoint” to “waypoint” smothing out any sharp transitions.
You have a great tool, use your imagination. You will be surprised what it can do.
Fish On….