To get better lacing on blue a breeder would have to produce birds that are eb or brown at the E locus. Then breed in the melanotic gene and the pattern gene. That should produce some very good lacing. Most blue birds are extended black or birchen. These two genes are not very good at producing lacing. If an individual would breed in the the pattern gene, dark brown and birchen you can get good lacing. I have never seen good lacing on a blue bird. Most of the time it is just edging and not a lace like you would find on a gold laced wyandotte or a sebright.
Tim