iii Sisters of Nature Lengthening Crème. I got a sample and purchased. It does help with shrinkage. Not 100% but it has helped. In the areas that shrink the most, 30%, and in the areas that don't, 40%. Softens my edges, too and nothing does that. I'll probably always buy it for that.
My hair is coarse and porous and wiry. I can handle a lot of products. My only con is that the shine value is low.