hm there shouldn't be a seam on the outside.. did you split the inside of the leg in 2 and move the parts to the proper sides? i started like you and used planar z then cut the leg in half. then i mapped it planar x for both outter part and inner part of the leg like in the top picture. then i lassoed half of the inner part, cut it and moved it to the bottom of the outter leg, joined and relaxed. same for the remaining half of the inner leg. you'll notice that there are some pink points wanting to be connected on the bottom (pic 3). ignore that and move the 2nd half of the leg to the top, join and relax it. now the seam should be on the inside of the leg instead of the outside. and after you do this and notice you want to clean up some of the seams, you can take little stray areas/points, cut them and move them to the other side of the seam and join them to that side. you can't select just the points and cut those... it has to be 3 or 4 points minimum before it can actually cut anything.. so basically anything that makes a triangle or square.