How do we fix it?? I suspect the proximity of the CV to the shore has something to do with it. How ever I don't know that. Maybe we need to make a test Map and check it out.
I believe that the reason we have that outline around the waypoint/tracks of the ships was to cut back on the dry spawns. If so, just adding another half mile to that distance might clear all of those few spots that are left. Of course that could mean issues with the more narrow straits some of the maps have.