A modified config file can't fix this.
A single color code can't give a red brick both light and dark edges. There must be something else wrong here.
Are some of the red bricks placed in a subfile, and that subfile have been colored in a color with light edges?
A single color code can't give a red brick both light and dark edges. There must be something else wrong here.
Are some of the red bricks placed in a subfile, and that subfile have been colored in a color with light edges?