What is an acceptable percentage of hairs that grow curling away from the skin in an Eyebrow Transplant?

For an FUE eyebrow transplant with 1b/c straight scalp hair (but still has a curl), what is an acceptable % of transplanted hairs that grow with the curl growing away from the skin? Even with a highly experienced surgeon, does hair curling away from the brows come with the territory with an FUE?