How to handle non-linear curb installation?

When curb installation isn't straight, it becomes very obvious later during asphalt paving or landscaping. The most common on-site issue isn't that workers don't know how to place them, but that the base isn't leveled, the control lines are pulled too casually, and curves are aligned just by eye. It looks fine right after installation, but once the road edges are finished, all the height and…